diff --git a/.gitea/workflows/deploy.yml b/.gitea/workflows/deploy.yml
index 9308ba4..96f770c 100644
--- a/.gitea/workflows/deploy.yml
+++ b/.gitea/workflows/deploy.yml
@@ -14,7 +14,7 @@ jobs:
       - name: Checkout
         run: |
           git clone --depth=1 --branch=${GITHUB_REF_NAME} \
-            ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}.git .
+            http://gitea:3000/${GITHUB_REPOSITORY}.git .
 
       - name: Configure Maven settings
         run: |
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..693a7f6
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,9 @@
+FROM eclipse-temurin:17-jre-alpine
+
+WORKDIR /app
+
+COPY target/gc-guide-api-*.jar app.jar
+
+EXPOSE 8080
+
+ENTRYPOINT ["java", "-jar", "app.jar"]
diff --git a/src/main/java/com/gcsc/guide/auth/AuthController.java b/src/main/java/com/gcsc/guide/auth/AuthController.java
index 174467d..2a6d750 100644
--- a/src/main/java/com/gcsc/guide/auth/AuthController.java
+++ b/src/main/java/com/gcsc/guide/auth/AuthController.java
@@ -5,7 +5,9 @@ import com.gcsc.guide.dto.GoogleLoginRequest;
 import com.gcsc.guide.dto.UserResponse;
 import com.gcsc.guide.entity.User;
 import com.gcsc.guide.repository.UserRepository;
+import com.gcsc.guide.service.ActivityService;
 import com.google.api.client.googleapis.auth.oauth2.GoogleIdToken;
+import jakarta.servlet.http.HttpServletRequest;
 import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
@@ -26,12 +28,15 @@ public class AuthController {
     private final GoogleTokenVerifier googleTokenVerifier;
     private final JwtTokenProvider jwtTokenProvider;
     private final UserRepository userRepository;
+    private final ActivityService activityService;
 
     /**
      * Google ID Token으로 로그인/회원가입 처리 후 JWT 발급
      */
     @PostMapping("/google")
-    public ResponseEntity<AuthResponse> googleLogin(@Valid @RequestBody GoogleLoginRequest request) {
+    public ResponseEntity<AuthResponse> googleLogin(
+            @Valid @RequestBody GoogleLoginRequest request,
+            HttpServletRequest httpRequest) {
         GoogleIdToken.Payload payload = googleTokenVerifier.verify(request.idToken());
         if (payload == null) {
             throw new ResponseStatusException(HttpStatus.UNAUTHORIZED, "유효하지 않은 Google 토큰입니다");
@@ -54,6 +59,11 @@ public class AuthController {
         User userWithRoles = userRepository.findByEmailWithRoles(email)
             .orElseThrow();
 
+        activityService.recordLogin(
+            userWithRoles.getId(),
+            httpRequest.getRemoteAddr(),
+            httpRequest.getHeader("User-Agent"));
+
         String token = jwtTokenProvider.generateToken(
             userWithRoles.getId(), userWithRoles.getEmail(), userWithRoles.isAdmin());
 
diff --git a/src/main/java/com/gcsc/guide/controller/ActivityController.java b/src/main/java/com/gcsc/guide/controller/ActivityController.java
new file mode 100644
index 0000000..212d510
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/controller/ActivityController.java
@@ -0,0 +1,40 @@
+package com.gcsc.guide.controller;
+
+import com.gcsc.guide.dto.LoginHistoryResponse;
+import com.gcsc.guide.dto.TrackPageViewRequest;
+import com.gcsc.guide.service.ActivityService;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.Authentication;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+/**
+ * 활동 기록 API
+ */
+@RestController
+@RequestMapping("/api/activity")
+@RequiredArgsConstructor
+public class ActivityController {
+
+    private final ActivityService activityService;
+
+    /** 페이지 뷰 기록 */
+    @PostMapping("/track")
+    public ResponseEntity<Void> trackPageView(
+            Authentication authentication,
+            @Valid @RequestBody TrackPageViewRequest request) {
+        Long userId = (Long) authentication.getPrincipal();
+        activityService.trackPageView(userId, request.pagePath());
+        return ResponseEntity.ok().build();
+    }
+
+    /** 현재 사용자의 로그인 이력 조회 */
+    @GetMapping("/login-history")
+    public ResponseEntity<List<LoginHistoryResponse>> getLoginHistory(Authentication authentication) {
+        Long userId = (Long) authentication.getPrincipal();
+        return ResponseEntity.ok(activityService.getLoginHistory(userId));
+    }
+}
diff --git a/src/main/java/com/gcsc/guide/controller/AdminRoleController.java b/src/main/java/com/gcsc/guide/controller/AdminRoleController.java
new file mode 100644
index 0000000..6538533
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/controller/AdminRoleController.java
@@ -0,0 +1,73 @@
+package com.gcsc.guide.controller;
+
+import com.gcsc.guide.dto.AddPermissionRequest;
+import com.gcsc.guide.dto.CreateRoleRequest;
+import com.gcsc.guide.dto.RoleResponse;
+import com.gcsc.guide.service.RoleService;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.net.URI;
+import java.util.List;
+
+/**
+ * 관리자 롤/권한 관리 API
+ */
+@RestController
+@RequestMapping("/api/admin/roles")
+@RequiredArgsConstructor
+public class AdminRoleController {
+
+    private final RoleService roleService;
+
+    /** 전체 롤 목록 */
+    @GetMapping
+    public ResponseEntity<List<RoleResponse>> getRoles() {
+        return ResponseEntity.ok(roleService.getRoles());
+    }
+
+    /** 롤 생성 */
+    @PostMapping
+    public ResponseEntity<RoleResponse> createRole(@Valid @RequestBody CreateRoleRequest request) {
+        RoleResponse role = roleService.createRole(request.name(), request.description());
+        return ResponseEntity.created(URI.create("/api/admin/roles/" + role.id())).body(role);
+    }
+
+    /** 롤 수정 */
+    @PutMapping("/{id}")
+    public ResponseEntity<RoleResponse> updateRole(
+            @PathVariable Long id,
+            @Valid @RequestBody CreateRoleRequest request) {
+        return ResponseEntity.ok(roleService.updateRole(id, request.name(), request.description()));
+    }
+
+    /** 롤 삭제 */
+    @DeleteMapping("/{id}")
+    public ResponseEntity<Void> deleteRole(@PathVariable Long id) {
+        roleService.deleteRole(id);
+        return ResponseEntity.noContent().build();
+    }
+
+    /** 롤의 URL 패턴 목록 */
+    @GetMapping("/{id}/permissions")
+    public ResponseEntity<List<String>> getPermissions(@PathVariable Long id) {
+        return ResponseEntity.ok(roleService.getPermissions(id));
+    }
+
+    /** URL 패턴 추가 */
+    @PostMapping("/{id}/permissions")
+    public ResponseEntity<RoleResponse> addPermission(
+            @PathVariable Long id,
+            @Valid @RequestBody AddPermissionRequest request) {
+        return ResponseEntity.ok(roleService.addPermission(id, request.urlPattern()));
+    }
+
+    /** URL 패턴 삭제 */
+    @DeleteMapping("/permissions/{permissionId}")
+    public ResponseEntity<Void> deletePermission(@PathVariable Long permissionId) {
+        roleService.deletePermission(permissionId);
+        return ResponseEntity.noContent().build();
+    }
+}
diff --git a/src/main/java/com/gcsc/guide/controller/AdminStatsController.java b/src/main/java/com/gcsc/guide/controller/AdminStatsController.java
new file mode 100644
index 0000000..0a4a6d7
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/controller/AdminStatsController.java
@@ -0,0 +1,26 @@
+package com.gcsc.guide.controller;
+
+import com.gcsc.guide.dto.StatsResponse;
+import com.gcsc.guide.service.UserService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * 관리자 통계 API
+ */
+@RestController
+@RequestMapping("/api/admin/stats")
+@RequiredArgsConstructor
+public class AdminStatsController {
+
+    private final UserService userService;
+
+    /** 전체 통계 조회 */
+    @GetMapping
+    public ResponseEntity<StatsResponse> getStats() {
+        return ResponseEntity.ok(userService.getStats());
+    }
+}
diff --git a/src/main/java/com/gcsc/guide/controller/AdminUserController.java b/src/main/java/com/gcsc/guide/controller/AdminUserController.java
new file mode 100644
index 0000000..2f53d71
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/controller/AdminUserController.java
@@ -0,0 +1,67 @@
+package com.gcsc.guide.controller;
+
+import com.gcsc.guide.dto.UpdateRolesRequest;
+import com.gcsc.guide.dto.UserResponse;
+import com.gcsc.guide.service.UserService;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+/**
+ * 관리자 사용자 관리 API
+ */
+@RestController
+@RequestMapping("/api/admin/users")
+@RequiredArgsConstructor
+public class AdminUserController {
+
+    private final UserService userService;
+
+    /** 전체 사용자 목록 조회 (status 필터 선택) */
+    @GetMapping
+    public ResponseEntity<List<UserResponse>> getUsers(
+            @RequestParam(required = false) String status) {
+        return ResponseEntity.ok(userService.getUsers(status));
+    }
+
+    /** 사용자 승인 (PENDING → ACTIVE) */
+    @PutMapping("/{id}/approve")
+    public ResponseEntity<UserResponse> approveUser(@PathVariable Long id) {
+        return ResponseEntity.ok(userService.approveUser(id));
+    }
+
+    /** 사용자 거절 (PENDING → REJECTED) */
+    @PutMapping("/{id}/reject")
+    public ResponseEntity<UserResponse> rejectUser(@PathVariable Long id) {
+        return ResponseEntity.ok(userService.rejectUser(id));
+    }
+
+    /** 사용자 비활성화 (ACTIVE → DISABLED) */
+    @PutMapping("/{id}/disable")
+    public ResponseEntity<UserResponse> disableUser(@PathVariable Long id) {
+        return ResponseEntity.ok(userService.disableUser(id));
+    }
+
+    /** 사용자 롤 업데이트 */
+    @PutMapping("/{id}/roles")
+    public ResponseEntity<UserResponse> updateUserRoles(
+            @PathVariable Long id,
+            @Valid @RequestBody UpdateRolesRequest request) {
+        return ResponseEntity.ok(userService.updateUserRoles(id, request.roleIds()));
+    }
+
+    /** 관리자 권한 부여 */
+    @PostMapping("/{id}/admin")
+    public ResponseEntity<UserResponse> grantAdmin(@PathVariable Long id) {
+        return ResponseEntity.ok(userService.grantAdmin(id));
+    }
+
+    /** 관리자 권한 해제 */
+    @DeleteMapping("/{id}/admin")
+    public ResponseEntity<UserResponse> revokeAdmin(@PathVariable Long id) {
+        return ResponseEntity.ok(userService.revokeAdmin(id));
+    }
+}
diff --git a/src/main/java/com/gcsc/guide/controller/IssueController.java b/src/main/java/com/gcsc/guide/controller/IssueController.java
new file mode 100644
index 0000000..5852b9e
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/controller/IssueController.java
@@ -0,0 +1,71 @@
+package com.gcsc.guide.controller;
+
+import com.gcsc.guide.dto.*;
+import com.gcsc.guide.service.IssueService;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Sort;
+import org.springframework.data.web.PageableDefault;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.Authentication;
+import org.springframework.web.bind.annotation.*;
+
+import java.net.URI;
+import java.util.Map;
+
+/**
+ * 이슈 관리 API
+ */
+@RestController
+@RequestMapping("/api/issues")
+@RequiredArgsConstructor
+public class IssueController {
+
+    private final IssueService issueService;
+
+    /** 이슈 목록 (status 필터, 페이징) */
+    @GetMapping
+    public ResponseEntity<Page<IssueResponse>> getIssues(
+            @RequestParam(required = false) String status,
+            @PageableDefault(size = 20, sort = "createdAt", direction = Sort.Direction.DESC) Pageable pageable) {
+        return ResponseEntity.ok(issueService.getIssues(status, pageable));
+    }
+
+    /** 이슈 생성 */
+    @PostMapping
+    public ResponseEntity<IssueResponse> createIssue(
+            Authentication authentication,
+            @Valid @RequestBody CreateIssueRequest request) {
+        Long authorId = (Long) authentication.getPrincipal();
+        IssueResponse issue = issueService.createIssue(authorId, request);
+        return ResponseEntity.created(URI.create("/api/issues/" + issue.id())).body(issue);
+    }
+
+    /** 이슈 상세 (코멘트 포함) */
+    @GetMapping("/{id}")
+    public ResponseEntity<Map<String, Object>> getIssue(@PathVariable Long id) {
+        return ResponseEntity.ok(issueService.getIssueDetail(id));
+    }
+
+    /** 이슈 수정 */
+    @PutMapping("/{id}")
+    public ResponseEntity<IssueResponse> updateIssue(
+            @PathVariable Long id,
+            @RequestBody UpdateIssueRequest request) {
+        return ResponseEntity.ok(issueService.updateIssue(id, request));
+    }
+
+    /** 코멘트 추가 */
+    @PostMapping("/{id}/comments")
+    public ResponseEntity<IssueCommentResponse> addComment(
+            @PathVariable Long id,
+            Authentication authentication,
+            @Valid @RequestBody CreateCommentRequest request) {
+        Long authorId = (Long) authentication.getPrincipal();
+        IssueCommentResponse comment = issueService.addComment(id, authorId, request.body());
+        return ResponseEntity.created(URI.create("/api/issues/" + id + "/comments/" + comment.id()))
+            .body(comment);
+    }
+}
diff --git a/src/main/java/com/gcsc/guide/dto/AddPermissionRequest.java b/src/main/java/com/gcsc/guide/dto/AddPermissionRequest.java
new file mode 100644
index 0000000..6f0f323
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/dto/AddPermissionRequest.java
@@ -0,0 +1,8 @@
+package com.gcsc.guide.dto;
+
+import jakarta.validation.constraints.NotBlank;
+
+public record AddPermissionRequest(
+    @NotBlank String urlPattern
+) {
+}
diff --git a/src/main/java/com/gcsc/guide/dto/CreateCommentRequest.java b/src/main/java/com/gcsc/guide/dto/CreateCommentRequest.java
new file mode 100644
index 0000000..ab8c3b3
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/dto/CreateCommentRequest.java
@@ -0,0 +1,8 @@
+package com.gcsc.guide.dto;
+
+import jakarta.validation.constraints.NotBlank;
+
+public record CreateCommentRequest(
+    @NotBlank String body
+) {
+}
diff --git a/src/main/java/com/gcsc/guide/dto/CreateIssueRequest.java b/src/main/java/com/gcsc/guide/dto/CreateIssueRequest.java
new file mode 100644
index 0000000..1fb7f75
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/dto/CreateIssueRequest.java
@@ -0,0 +1,14 @@
+package com.gcsc.guide.dto;
+
+import jakarta.validation.constraints.NotBlank;
+
+public record CreateIssueRequest(
+    @NotBlank String title,
+    String body,
+    String priority,
+    String project,
+    String location,
+    String giteaIssueUrl,
+    Integer giteaIssueId
+) {
+}
diff --git a/src/main/java/com/gcsc/guide/dto/CreateRoleRequest.java b/src/main/java/com/gcsc/guide/dto/CreateRoleRequest.java
new file mode 100644
index 0000000..677b356
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/dto/CreateRoleRequest.java
@@ -0,0 +1,9 @@
+package com.gcsc.guide.dto;
+
+import jakarta.validation.constraints.NotBlank;
+
+public record CreateRoleRequest(
+    @NotBlank String name,
+    String description
+) {
+}
diff --git a/src/main/java/com/gcsc/guide/dto/IssueCommentResponse.java b/src/main/java/com/gcsc/guide/dto/IssueCommentResponse.java
new file mode 100644
index 0000000..ba19f07
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/dto/IssueCommentResponse.java
@@ -0,0 +1,30 @@
+package com.gcsc.guide.dto;
+
+import com.gcsc.guide.entity.IssueComment;
+
+import java.time.LocalDateTime;
+
+public record IssueCommentResponse(
+    Long id,
+    String body,
+    IssueResponse.AuthorInfo author,
+    LocalDateTime createdAt
+) {
+
+    public static IssueCommentResponse from(IssueComment comment) {
+        IssueResponse.AuthorInfo authorInfo = comment.getAuthor() != null
+            ? new IssueResponse.AuthorInfo(
+                comment.getAuthor().getId(),
+                comment.getAuthor().getName(),
+                comment.getAuthor().getEmail(),
+                comment.getAuthor().getAvatarUrl())
+            : null;
+
+        return new IssueCommentResponse(
+            comment.getId(),
+            comment.getBody(),
+            authorInfo,
+            comment.getCreatedAt()
+        );
+    }
+}
diff --git a/src/main/java/com/gcsc/guide/dto/IssueResponse.java b/src/main/java/com/gcsc/guide/dto/IssueResponse.java
new file mode 100644
index 0000000..c875547
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/dto/IssueResponse.java
@@ -0,0 +1,53 @@
+package com.gcsc.guide.dto;
+
+import com.gcsc.guide.entity.Issue;
+
+import java.time.LocalDateTime;
+
+public record IssueResponse(
+    Long id,
+    String title,
+    String body,
+    String status,
+    String priority,
+    String project,
+    String location,
+    String giteaIssueUrl,
+    Integer giteaIssueId,
+    AuthorInfo author,
+    AuthorInfo assignee,
+    LocalDateTime createdAt,
+    LocalDateTime updatedAt
+) {
+
+    public record AuthorInfo(Long id, String name, String email, String avatarUrl) {
+    }
+
+    public static IssueResponse from(Issue issue) {
+        AuthorInfo authorInfo = issue.getAuthor() != null
+            ? new AuthorInfo(issue.getAuthor().getId(), issue.getAuthor().getName(),
+                             issue.getAuthor().getEmail(), issue.getAuthor().getAvatarUrl())
+            : null;
+
+        AuthorInfo assigneeInfo = issue.getAssignee() != null
+            ? new AuthorInfo(issue.getAssignee().getId(), issue.getAssignee().getName(),
+                             issue.getAssignee().getEmail(), issue.getAssignee().getAvatarUrl())
+            : null;
+
+        return new IssueResponse(
+            issue.getId(),
+            issue.getTitle(),
+            issue.getBody(),
+            issue.getStatus(),
+            issue.getPriority(),
+            issue.getProject(),
+            issue.getLocation(),
+            issue.getGiteaIssueUrl(),
+            issue.getGiteaIssueId(),
+            authorInfo,
+            assigneeInfo,
+            issue.getCreatedAt(),
+            issue.getUpdatedAt()
+        );
+    }
+}
diff --git a/src/main/java/com/gcsc/guide/dto/LoginHistoryResponse.java b/src/main/java/com/gcsc/guide/dto/LoginHistoryResponse.java
new file mode 100644
index 0000000..f3cb518
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/dto/LoginHistoryResponse.java
@@ -0,0 +1,22 @@
+package com.gcsc.guide.dto;
+
+import com.gcsc.guide.entity.LoginHistory;
+
+import java.time.LocalDateTime;
+
+public record LoginHistoryResponse(
+    Long id,
+    LocalDateTime loginAt,
+    String ipAddress,
+    String userAgent
+) {
+
+    public static LoginHistoryResponse from(LoginHistory history) {
+        return new LoginHistoryResponse(
+            history.getId(),
+            history.getLoginAt(),
+            history.getIpAddress(),
+            history.getUserAgent()
+        );
+    }
+}
diff --git a/src/main/java/com/gcsc/guide/dto/StatsResponse.java b/src/main/java/com/gcsc/guide/dto/StatsResponse.java
new file mode 100644
index 0000000..54656a5
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/dto/StatsResponse.java
@@ -0,0 +1,12 @@
+package com.gcsc.guide.dto;
+
+public record StatsResponse(
+    long totalUsers,
+    long activeUsers,
+    long pendingUsers,
+    long rejectedUsers,
+    long disabledUsers,
+    long todayLogins,
+    long totalRoles
+) {
+}
diff --git a/src/main/java/com/gcsc/guide/dto/TrackPageViewRequest.java b/src/main/java/com/gcsc/guide/dto/TrackPageViewRequest.java
new file mode 100644
index 0000000..dc17a9c
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/dto/TrackPageViewRequest.java
@@ -0,0 +1,8 @@
+package com.gcsc.guide.dto;
+
+import jakarta.validation.constraints.NotBlank;
+
+public record TrackPageViewRequest(
+    @NotBlank String pagePath
+) {
+}
diff --git a/src/main/java/com/gcsc/guide/dto/UpdateIssueRequest.java b/src/main/java/com/gcsc/guide/dto/UpdateIssueRequest.java
new file mode 100644
index 0000000..c874e6d
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/dto/UpdateIssueRequest.java
@@ -0,0 +1,14 @@
+package com.gcsc.guide.dto;
+
+public record UpdateIssueRequest(
+    String title,
+    String body,
+    String status,
+    String priority,
+    String project,
+    String location,
+    Long assigneeId,
+    String giteaIssueUrl,
+    Integer giteaIssueId
+) {
+}
diff --git a/src/main/java/com/gcsc/guide/dto/UpdateRolesRequest.java b/src/main/java/com/gcsc/guide/dto/UpdateRolesRequest.java
new file mode 100644
index 0000000..5c3a44a
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/dto/UpdateRolesRequest.java
@@ -0,0 +1,10 @@
+package com.gcsc.guide.dto;
+
+import jakarta.validation.constraints.NotNull;
+
+import java.util.List;
+
+public record UpdateRolesRequest(
+    @NotNull List<Long> roleIds
+) {
+}
diff --git a/src/main/java/com/gcsc/guide/entity/Issue.java b/src/main/java/com/gcsc/guide/entity/Issue.java
new file mode 100644
index 0000000..05e6ce9
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/entity/Issue.java
@@ -0,0 +1,99 @@
+package com.gcsc.guide.entity;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "issues")
+@Getter
+@NoArgsConstructor
+public class Issue {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(nullable = false)
+    private String title;
+
+    @Column(columnDefinition = "TEXT")
+    private String body;
+
+    @Column(nullable = false, length = 20)
+    private String status = "OPEN";
+
+    @Column(nullable = false, length = 20)
+    private String priority = "NORMAL";
+
+    @Column(length = 100)
+    private String project;
+
+    @Column(length = 255)
+    private String location;
+
+    @Column(name = "gitea_issue_url", length = 500)
+    private String giteaIssueUrl;
+
+    @Column(name = "gitea_issue_id")
+    private Integer giteaIssueId;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "author_id")
+    private User author;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "assignee_id")
+    private User assignee;
+
+    @Column(name = "created_at", nullable = false, updatable = false)
+    private LocalDateTime createdAt;
+
+    @Column(name = "updated_at", nullable = false)
+    private LocalDateTime updatedAt;
+
+    public Issue(String title, String body, String priority, String project,
+                 String location, User author) {
+        this.title = title;
+        this.body = body;
+        this.priority = priority;
+        this.project = project;
+        this.location = location;
+        this.author = author;
+    }
+
+    public void update(String title, String body, String priority,
+                       String project, String location) {
+        this.title = title;
+        this.body = body;
+        this.priority = priority;
+        this.project = project;
+        this.location = location;
+    }
+
+    public void updateStatus(String status) {
+        this.status = status;
+    }
+
+    public void assignTo(User assignee) {
+        this.assignee = assignee;
+    }
+
+    public void linkGiteaIssue(String giteaIssueUrl, Integer giteaIssueId) {
+        this.giteaIssueUrl = giteaIssueUrl;
+        this.giteaIssueId = giteaIssueId;
+    }
+
+    @PrePersist
+    protected void onCreate() {
+        this.createdAt = LocalDateTime.now();
+        this.updatedAt = LocalDateTime.now();
+    }
+
+    @PreUpdate
+    protected void onUpdate() {
+        this.updatedAt = LocalDateTime.now();
+    }
+}
diff --git a/src/main/java/com/gcsc/guide/entity/IssueComment.java b/src/main/java/com/gcsc/guide/entity/IssueComment.java
new file mode 100644
index 0000000..9d2b735
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/entity/IssueComment.java
@@ -0,0 +1,43 @@
+package com.gcsc.guide.entity;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "issue_comments")
+@Getter
+@NoArgsConstructor
+public class IssueComment {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "issue_id", nullable = false)
+    private Issue issue;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "author_id")
+    private User author;
+
+    @Column(nullable = false, columnDefinition = "TEXT")
+    private String body;
+
+    @Column(name = "created_at", nullable = false, updatable = false)
+    private LocalDateTime createdAt;
+
+    public IssueComment(Issue issue, User author, String body) {
+        this.issue = issue;
+        this.author = author;
+        this.body = body;
+    }
+
+    @PrePersist
+    protected void onCreate() {
+        this.createdAt = LocalDateTime.now();
+    }
+}
diff --git a/src/main/java/com/gcsc/guide/entity/LoginHistory.java b/src/main/java/com/gcsc/guide/entity/LoginHistory.java
new file mode 100644
index 0000000..434a25f
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/entity/LoginHistory.java
@@ -0,0 +1,42 @@
+package com.gcsc.guide.entity;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "login_history")
+@Getter
+@NoArgsConstructor
+public class LoginHistory {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "user_id")
+    private User user;
+
+    @Column(name = "login_at", nullable = false, updatable = false)
+    private LocalDateTime loginAt;
+
+    @Column(name = "ip_address", length = 45)
+    private String ipAddress;
+
+    @Column(name = "user_agent", length = 500)
+    private String userAgent;
+
+    public LoginHistory(User user, String ipAddress, String userAgent) {
+        this.user = user;
+        this.ipAddress = ipAddress;
+        this.userAgent = userAgent;
+    }
+
+    @PrePersist
+    protected void onCreate() {
+        this.loginAt = LocalDateTime.now();
+    }
+}
diff --git a/src/main/java/com/gcsc/guide/entity/PageView.java b/src/main/java/com/gcsc/guide/entity/PageView.java
new file mode 100644
index 0000000..f68e871
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/entity/PageView.java
@@ -0,0 +1,38 @@
+package com.gcsc.guide.entity;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "page_views")
+@Getter
+@NoArgsConstructor
+public class PageView {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "user_id")
+    private User user;
+
+    @Column(name = "page_path", nullable = false)
+    private String pagePath;
+
+    @Column(name = "viewed_at", nullable = false, updatable = false)
+    private LocalDateTime viewedAt;
+
+    public PageView(User user, String pagePath) {
+        this.user = user;
+        this.pagePath = pagePath;
+    }
+
+    @PrePersist
+    protected void onCreate() {
+        this.viewedAt = LocalDateTime.now();
+    }
+}
diff --git a/src/main/java/com/gcsc/guide/exception/BusinessException.java b/src/main/java/com/gcsc/guide/exception/BusinessException.java
new file mode 100644
index 0000000..37efb03
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/exception/BusinessException.java
@@ -0,0 +1,8 @@
+package com.gcsc.guide.exception;
+
+public class BusinessException extends RuntimeException {
+
+    public BusinessException(String message) {
+        super(message);
+    }
+}
diff --git a/src/main/java/com/gcsc/guide/exception/GlobalExceptionHandler.java b/src/main/java/com/gcsc/guide/exception/GlobalExceptionHandler.java
new file mode 100644
index 0000000..cec7073
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/exception/GlobalExceptionHandler.java
@@ -0,0 +1,56 @@
+package com.gcsc.guide.exception;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+import org.springframework.web.server.ResponseStatusException;
+
+import java.time.LocalDateTime;
+import java.util.Map;
+
+@Slf4j
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(ResourceNotFoundException.class)
+    public ResponseEntity<Map<String, Object>> handleNotFound(ResourceNotFoundException e) {
+        return buildResponse(HttpStatus.NOT_FOUND, e.getMessage());
+    }
+
+    @ExceptionHandler(BusinessException.class)
+    public ResponseEntity<Map<String, Object>> handleBusiness(BusinessException e) {
+        return buildResponse(HttpStatus.BAD_REQUEST, e.getMessage());
+    }
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ResponseEntity<Map<String, Object>> handleValidation(MethodArgumentNotValidException e) {
+        String message = e.getBindingResult().getFieldErrors().stream()
+            .map(fe -> fe.getField() + ": " + fe.getDefaultMessage())
+            .reduce((a, b) -> a + ", " + b)
+            .orElse("입력값이 올바르지 않습니다");
+        return buildResponse(HttpStatus.BAD_REQUEST, message);
+    }
+
+    @ExceptionHandler(ResponseStatusException.class)
+    public ResponseEntity<Map<String, Object>> handleResponseStatus(ResponseStatusException e) {
+        return buildResponse(HttpStatus.valueOf(e.getStatusCode().value()), e.getReason());
+    }
+
+    @ExceptionHandler(Exception.class)
+    public ResponseEntity<Map<String, Object>> handleUnexpected(Exception e) {
+        log.error("예상치 못한 오류 발생", e);
+        return buildResponse(HttpStatus.INTERNAL_SERVER_ERROR, "서버 내부 오류가 발생했습니다");
+    }
+
+    private ResponseEntity<Map<String, Object>> buildResponse(HttpStatus status, String message) {
+        return ResponseEntity.status(status).body(Map.of(
+            "status", status.value(),
+            "error", status.getReasonPhrase(),
+            "message", message != null ? message : "알 수 없는 오류",
+            "timestamp", LocalDateTime.now().toString()
+        ));
+    }
+}
diff --git a/src/main/java/com/gcsc/guide/exception/ResourceNotFoundException.java b/src/main/java/com/gcsc/guide/exception/ResourceNotFoundException.java
new file mode 100644
index 0000000..9677dee
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/exception/ResourceNotFoundException.java
@@ -0,0 +1,12 @@
+package com.gcsc.guide.exception;
+
+public class ResourceNotFoundException extends RuntimeException {
+
+    public ResourceNotFoundException(String resource, Long id) {
+        super(resource + "을(를) 찾을 수 없습니다 (id=" + id + ")");
+    }
+
+    public ResourceNotFoundException(String message) {
+        super(message);
+    }
+}
diff --git a/src/main/java/com/gcsc/guide/repository/IssueCommentRepository.java b/src/main/java/com/gcsc/guide/repository/IssueCommentRepository.java
new file mode 100644
index 0000000..4d2782b
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/repository/IssueCommentRepository.java
@@ -0,0 +1,13 @@
+package com.gcsc.guide.repository;
+
+import com.gcsc.guide.entity.IssueComment;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+
+import java.util.List;
+
+public interface IssueCommentRepository extends JpaRepository<IssueComment, Long> {
+
+    @Query("SELECT c FROM IssueComment c JOIN FETCH c.author WHERE c.issue.id = :issueId ORDER BY c.createdAt ASC")
+    List<IssueComment> findByIssueIdWithAuthor(Long issueId);
+}
diff --git a/src/main/java/com/gcsc/guide/repository/IssueRepository.java b/src/main/java/com/gcsc/guide/repository/IssueRepository.java
new file mode 100644
index 0000000..3561f6c
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/repository/IssueRepository.java
@@ -0,0 +1,17 @@
+package com.gcsc.guide.repository;
+
+import com.gcsc.guide.entity.Issue;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+
+import java.util.Optional;
+
+public interface IssueRepository extends JpaRepository<Issue, Long> {
+
+    Page<Issue> findByStatus(String status, Pageable pageable);
+
+    @Query("SELECT i FROM Issue i LEFT JOIN FETCH i.author LEFT JOIN FETCH i.assignee WHERE i.id = :id")
+    Optional<Issue> findByIdWithUsers(Long id);
+}
diff --git a/src/main/java/com/gcsc/guide/repository/LoginHistoryRepository.java b/src/main/java/com/gcsc/guide/repository/LoginHistoryRepository.java
new file mode 100644
index 0000000..ee3a90a
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/repository/LoginHistoryRepository.java
@@ -0,0 +1,14 @@
+package com.gcsc.guide.repository;
+
+import com.gcsc.guide.entity.LoginHistory;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+public interface LoginHistoryRepository extends JpaRepository<LoginHistory, Long> {
+
+    List<LoginHistory> findByUserIdOrderByLoginAtDesc(Long userId);
+
+    long countByLoginAtAfter(LocalDateTime after);
+}
diff --git a/src/main/java/com/gcsc/guide/repository/PageViewRepository.java b/src/main/java/com/gcsc/guide/repository/PageViewRepository.java
new file mode 100644
index 0000000..5561f61
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/repository/PageViewRepository.java
@@ -0,0 +1,7 @@
+package com.gcsc.guide.repository;
+
+import com.gcsc.guide.entity.PageView;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface PageViewRepository extends JpaRepository<PageView, Long> {
+}
diff --git a/src/main/java/com/gcsc/guide/repository/RoleUrlPatternRepository.java b/src/main/java/com/gcsc/guide/repository/RoleUrlPatternRepository.java
new file mode 100644
index 0000000..aa8b7c1
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/repository/RoleUrlPatternRepository.java
@@ -0,0 +1,7 @@
+package com.gcsc.guide.repository;
+
+import com.gcsc.guide.entity.RoleUrlPattern;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface RoleUrlPatternRepository extends JpaRepository<RoleUrlPattern, Long> {
+}
diff --git a/src/main/java/com/gcsc/guide/service/ActivityService.java b/src/main/java/com/gcsc/guide/service/ActivityService.java
new file mode 100644
index 0000000..0e706af
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/service/ActivityService.java
@@ -0,0 +1,45 @@
+package com.gcsc.guide.service;
+
+import com.gcsc.guide.dto.LoginHistoryResponse;
+import com.gcsc.guide.entity.LoginHistory;
+import com.gcsc.guide.entity.PageView;
+import com.gcsc.guide.entity.User;
+import com.gcsc.guide.exception.ResourceNotFoundException;
+import com.gcsc.guide.repository.LoginHistoryRepository;
+import com.gcsc.guide.repository.PageViewRepository;
+import com.gcsc.guide.repository.UserRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+
+@Service
+@RequiredArgsConstructor
+public class ActivityService {
+
+    private final LoginHistoryRepository loginHistoryRepository;
+    private final PageViewRepository pageViewRepository;
+    private final UserRepository userRepository;
+
+    @Transactional
+    public void recordLogin(Long userId, String ipAddress, String userAgent) {
+        User user = userRepository.findById(userId)
+            .orElseThrow(() -> new ResourceNotFoundException("사용자", userId));
+        loginHistoryRepository.save(new LoginHistory(user, ipAddress, userAgent));
+    }
+
+    @Transactional
+    public void trackPageView(Long userId, String pagePath) {
+        User user = userRepository.findById(userId)
+            .orElseThrow(() -> new ResourceNotFoundException("사용자", userId));
+        pageViewRepository.save(new PageView(user, pagePath));
+    }
+
+    @Transactional(readOnly = true)
+    public List<LoginHistoryResponse> getLoginHistory(Long userId) {
+        return loginHistoryRepository.findByUserIdOrderByLoginAtDesc(userId).stream()
+            .map(LoginHistoryResponse::from)
+            .toList();
+    }
+}
diff --git a/src/main/java/com/gcsc/guide/service/IssueService.java b/src/main/java/com/gcsc/guide/service/IssueService.java
new file mode 100644
index 0000000..487ac49
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/service/IssueService.java
@@ -0,0 +1,118 @@
+package com.gcsc.guide.service;
+
+import com.gcsc.guide.dto.*;
+import com.gcsc.guide.entity.Issue;
+import com.gcsc.guide.entity.IssueComment;
+import com.gcsc.guide.entity.User;
+import com.gcsc.guide.exception.ResourceNotFoundException;
+import com.gcsc.guide.repository.IssueCommentRepository;
+import com.gcsc.guide.repository.IssueRepository;
+import com.gcsc.guide.repository.UserRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+import java.util.Map;
+
+@Service
+@RequiredArgsConstructor
+public class IssueService {
+
+    private final IssueRepository issueRepository;
+    private final IssueCommentRepository issueCommentRepository;
+    private final UserRepository userRepository;
+
+    @Transactional(readOnly = true)
+    public Page<IssueResponse> getIssues(String status, Pageable pageable) {
+        Page<Issue> issues;
+        if (status != null && !status.isBlank()) {
+            issues = issueRepository.findByStatus(status.toUpperCase(), pageable);
+        } else {
+            issues = issueRepository.findAll(pageable);
+        }
+        return issues.map(IssueResponse::from);
+    }
+
+    @Transactional
+    public IssueResponse createIssue(Long authorId, CreateIssueRequest request) {
+        User author = userRepository.findById(authorId)
+            .orElseThrow(() -> new ResourceNotFoundException("사용자", authorId));
+
+        Issue issue = new Issue(
+            request.title(),
+            request.body(),
+            request.priority() != null ? request.priority() : "NORMAL",
+            request.project(),
+            request.location(),
+            author
+        );
+
+        if (request.giteaIssueUrl() != null) {
+            issue.linkGiteaIssue(request.giteaIssueUrl(), request.giteaIssueId());
+        }
+
+        return IssueResponse.from(issueRepository.save(issue));
+    }
+
+    @Transactional(readOnly = true)
+    public Map<String, Object> getIssueDetail(Long issueId) {
+        Issue issue = issueRepository.findByIdWithUsers(issueId)
+            .orElseThrow(() -> new ResourceNotFoundException("이슈", issueId));
+
+        List<IssueCommentResponse> comments = issueCommentRepository
+            .findByIssueIdWithAuthor(issueId).stream()
+            .map(IssueCommentResponse::from)
+            .toList();
+
+        return Map.of(
+            "issue", IssueResponse.from(issue),
+            "comments", comments
+        );
+    }
+
+    @Transactional
+    public IssueResponse updateIssue(Long issueId, UpdateIssueRequest request) {
+        Issue issue = issueRepository.findByIdWithUsers(issueId)
+            .orElseThrow(() -> new ResourceNotFoundException("이슈", issueId));
+
+        if (request.title() != null) {
+            issue.update(
+                request.title(),
+                request.body(),
+                request.priority() != null ? request.priority() : issue.getPriority(),
+                request.project() != null ? request.project() : issue.getProject(),
+                request.location() != null ? request.location() : issue.getLocation()
+            );
+        }
+
+        if (request.status() != null) {
+            issue.updateStatus(request.status().toUpperCase());
+        }
+
+        if (request.assigneeId() != null) {
+            User assignee = userRepository.findById(request.assigneeId())
+                .orElseThrow(() -> new ResourceNotFoundException("담당자", request.assigneeId()));
+            issue.assignTo(assignee);
+        }
+
+        if (request.giteaIssueUrl() != null) {
+            issue.linkGiteaIssue(request.giteaIssueUrl(), request.giteaIssueId());
+        }
+
+        return IssueResponse.from(issueRepository.save(issue));
+    }
+
+    @Transactional
+    public IssueCommentResponse addComment(Long issueId, Long authorId, String body) {
+        Issue issue = issueRepository.findById(issueId)
+            .orElseThrow(() -> new ResourceNotFoundException("이슈", issueId));
+        User author = userRepository.findById(authorId)
+            .orElseThrow(() -> new ResourceNotFoundException("사용자", authorId));
+
+        IssueComment comment = new IssueComment(issue, author, body);
+        return IssueCommentResponse.from(issueCommentRepository.save(comment));
+    }
+}
diff --git a/src/main/java/com/gcsc/guide/service/RoleService.java b/src/main/java/com/gcsc/guide/service/RoleService.java
new file mode 100644
index 0000000..1cfc1db
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/service/RoleService.java
@@ -0,0 +1,88 @@
+package com.gcsc.guide.service;
+
+import com.gcsc.guide.dto.RoleResponse;
+import com.gcsc.guide.entity.Role;
+import com.gcsc.guide.entity.RoleUrlPattern;
+import com.gcsc.guide.exception.BusinessException;
+import com.gcsc.guide.exception.ResourceNotFoundException;
+import com.gcsc.guide.repository.RoleRepository;
+import com.gcsc.guide.repository.RoleUrlPatternRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+
+@Service
+@RequiredArgsConstructor
+public class RoleService {
+
+    private final RoleRepository roleRepository;
+    private final RoleUrlPatternRepository roleUrlPatternRepository;
+
+    @Transactional(readOnly = true)
+    public List<RoleResponse> getRoles() {
+        return roleRepository.findAllWithUrlPatterns().stream()
+            .map(RoleResponse::from)
+            .toList();
+    }
+
+    @Transactional
+    public RoleResponse createRole(String name, String description) {
+        roleRepository.findByName(name).ifPresent(r -> {
+            throw new BusinessException("이미 존재하는 롤 이름입니다: " + name);
+        });
+        Role role = new Role(name, description);
+        return RoleResponse.from(roleRepository.save(role));
+    }
+
+    @Transactional
+    public RoleResponse updateRole(Long roleId, String name, String description) {
+        Role role = findRoleById(roleId);
+        roleRepository.findByName(name)
+            .filter(r -> !r.getId().equals(roleId))
+            .ifPresent(r -> {
+                throw new BusinessException("이미 존재하는 롤 이름입니다: " + name);
+            });
+        role.update(name, description);
+        return RoleResponse.from(roleRepository.save(role));
+    }
+
+    @Transactional
+    public void deleteRole(Long roleId) {
+        if (!roleRepository.existsById(roleId)) {
+            throw new ResourceNotFoundException("롤", roleId);
+        }
+        roleRepository.deleteById(roleId);
+    }
+
+    @Transactional(readOnly = true)
+    public List<String> getPermissions(Long roleId) {
+        Role role = roleRepository.findByIdWithUrlPatterns(roleId)
+            .orElseThrow(() -> new ResourceNotFoundException("롤", roleId));
+        return role.getUrlPatterns().stream()
+            .map(RoleUrlPattern::getUrlPattern)
+            .toList();
+    }
+
+    @Transactional
+    public RoleResponse addPermission(Long roleId, String urlPattern) {
+        Role role = roleRepository.findByIdWithUrlPatterns(roleId)
+            .orElseThrow(() -> new ResourceNotFoundException("롤", roleId));
+        role.getUrlPatterns().add(new RoleUrlPattern(role, urlPattern));
+        return RoleResponse.from(roleRepository.save(role));
+    }
+
+    @Transactional
+    public void deletePermission(Long permissionId) {
+        if (!roleUrlPatternRepository.existsById(permissionId)) {
+            throw new ResourceNotFoundException("권한", permissionId);
+        }
+        roleUrlPatternRepository.deleteById(permissionId);
+    }
+
+    private Role findRoleById(Long roleId) {
+        return roleRepository.findById(roleId)
+            .orElseThrow(() -> new ResourceNotFoundException("롤", roleId));
+    }
+}
diff --git a/src/main/java/com/gcsc/guide/service/UserService.java b/src/main/java/com/gcsc/guide/service/UserService.java
new file mode 100644
index 0000000..c38fdc6
--- /dev/null
+++ b/src/main/java/com/gcsc/guide/service/UserService.java
@@ -0,0 +1,120 @@
+package com.gcsc.guide.service;
+
+import com.gcsc.guide.dto.StatsResponse;
+import com.gcsc.guide.dto.UserResponse;
+import com.gcsc.guide.entity.Role;
+import com.gcsc.guide.entity.User;
+import com.gcsc.guide.entity.UserStatus;
+import com.gcsc.guide.exception.BusinessException;
+import com.gcsc.guide.exception.ResourceNotFoundException;
+import com.gcsc.guide.repository.LoginHistoryRepository;
+import com.gcsc.guide.repository.RoleRepository;
+import com.gcsc.guide.repository.UserRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.time.LocalDate;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+@Service
+@RequiredArgsConstructor
+public class UserService {
+
+    private final UserRepository userRepository;
+    private final RoleRepository roleRepository;
+    private final LoginHistoryRepository loginHistoryRepository;
+
+    @Transactional(readOnly = true)
+    public List<UserResponse> getUsers(String status) {
+        List<User> users;
+        if (status != null && !status.isBlank()) {
+            UserStatus userStatus = UserStatus.valueOf(status.toUpperCase());
+            users = userRepository.findByStatus(userStatus);
+        } else {
+            users = userRepository.findAll();
+        }
+        return users.stream().map(UserResponse::from).toList();
+    }
+
+    @Transactional
+    public UserResponse approveUser(Long userId) {
+        User user = findUserById(userId);
+        if (user.getStatus() != UserStatus.PENDING) {
+            throw new BusinessException("PENDING 상태의 사용자만 승인할 수 있습니다 (현재: " + user.getStatus() + ")");
+        }
+        user.activate();
+        return UserResponse.from(userRepository.save(user));
+    }
+
+    @Transactional
+    public UserResponse rejectUser(Long userId) {
+        User user = findUserById(userId);
+        if (user.getStatus() != UserStatus.PENDING) {
+            throw new BusinessException("PENDING 상태의 사용자만 거절할 수 있습니다 (현재: " + user.getStatus() + ")");
+        }
+        user.reject();
+        return UserResponse.from(userRepository.save(user));
+    }
+
+    @Transactional
+    public UserResponse disableUser(Long userId) {
+        User user = findUserById(userId);
+        if (user.getStatus() != UserStatus.ACTIVE) {
+            throw new BusinessException("ACTIVE 상태의 사용자만 비활성화할 수 있습니다 (현재: " + user.getStatus() + ")");
+        }
+        user.disable();
+        return UserResponse.from(userRepository.save(user));
+    }
+
+    @Transactional
+    public UserResponse updateUserRoles(Long userId, List<Long> roleIds) {
+        User user = findUserById(userId);
+        Set<Role> roles = new HashSet<>(roleRepository.findAllById(roleIds));
+        if (roles.size() != roleIds.size()) {
+            throw new BusinessException("일부 롤을 찾을 수 없습니다");
+        }
+        user.updateRoles(roles);
+        userRepository.save(user);
+
+        return UserResponse.from(userRepository.findByIdWithRoles(userId).orElseThrow());
+    }
+
+    @Transactional
+    public UserResponse grantAdmin(Long userId) {
+        User user = findUserById(userId);
+        user.grantAdmin();
+        return UserResponse.from(userRepository.save(user));
+    }
+
+    @Transactional
+    public UserResponse revokeAdmin(Long userId) {
+        User user = findUserById(userId);
+        user.revokeAdmin();
+        return UserResponse.from(userRepository.save(user));
+    }
+
+    @Transactional(readOnly = true)
+    public StatsResponse getStats() {
+        long totalUsers = userRepository.count();
+        long activeUsers = userRepository.countByStatus(UserStatus.ACTIVE);
+        long pendingUsers = userRepository.countByStatus(UserStatus.PENDING);
+        long rejectedUsers = userRepository.countByStatus(UserStatus.REJECTED);
+        long disabledUsers = userRepository.countByStatus(UserStatus.DISABLED);
+        long todayLogins = loginHistoryRepository.countByLoginAtAfter(
+            LocalDate.now().atStartOfDay());
+        long totalRoles = roleRepository.count();
+
+        return new StatsResponse(
+            totalUsers, activeUsers, pendingUsers,
+            rejectedUsers, disabledUsers, todayLogins, totalRoles
+        );
+    }
+
+    private User findUserById(Long userId) {
+        return userRepository.findById(userId)
+            .orElseThrow(() -> new ResourceNotFoundException("사용자", userId));
+    }
+}