diff --git a/src/main/java/clap/server/adapter/inbound/web/admin/AddCategoryController.java b/src/main/java/clap/server/adapter/inbound/web/admin/AddCategoryController.java
index 9b9f18ed..d2d99ca1 100644
--- a/src/main/java/clap/server/adapter/inbound/web/admin/AddCategoryController.java
+++ b/src/main/java/clap/server/adapter/inbound/web/admin/AddCategoryController.java
@@ -35,7 +35,11 @@ public void addMainCategory(@AuthenticationPrincipal SecurityUserDetails userInf
     @PostMapping("/sub-category")
     @Secured("ROLE_ADMIN")
     public void addSubCategory(@AuthenticationPrincipal SecurityUserDetails userInfo, @Valid @RequestBody AddSubCategoryRequest addCategoryRequest) {
-        addSubCategoryUsecase.addSubCategory(userInfo.getUserId(), addCategoryRequest.mainCategoryId(), addCategoryRequest.code(), addCategoryRequest.name());
+        addSubCategoryUsecase.addSubCategory(userInfo.getUserId(),
+                addCategoryRequest.mainCategoryId(),
+                addCategoryRequest.code(),
+                addCategoryRequest.name(),
+                addCategoryRequest.descriptionExample());
     }
 
 }
\ No newline at end of file
diff --git a/src/main/java/clap/server/adapter/inbound/web/admin/FindCategoryController.java b/src/main/java/clap/server/adapter/inbound/web/admin/FindCategoryController.java
index bb9e97ec..89b7264f 100644
--- a/src/main/java/clap/server/adapter/inbound/web/admin/FindCategoryController.java
+++ b/src/main/java/clap/server/adapter/inbound/web/admin/FindCategoryController.java
@@ -13,6 +13,7 @@
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.access.annotation.Secured;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestMapping;
 
 import java.util.List;
@@ -33,17 +34,24 @@ public ResponseEntity<List<FindAllCategoryResponse>> findAllCategory() {
         return ResponseEntity.ok(findAllCategoryUsecase.findAllCategory());
     }
 
-    @Operation(summary = "1차 카테고리 조회")
+    @Operation(summary = "1차 카테고리 목록 조회")
     @GetMapping("/main-category")
     @Secured({"ROLE_USER", "ROLE_MANAGER", "ROLE_ADMIN"})
     public ResponseEntity<List<FindMainCategoryResponse>> findMainCategory() {
         return ResponseEntity.ok(findmainCategoryUsecase.findMainCategory());
     }
 
-    @Operation(summary = "2차 카테고리 조회")
+    @Operation(summary = "2차 카테고리 목록 조회")
     @GetMapping("/sub-category")
     @Secured({"ROLE_USER", "ROLE_MANAGER", "ROLE_ADMIN"})
     public ResponseEntity<List<FindSubCategoryResponse>> findSubCategory() {
         return ResponseEntity.ok(findsubCategoryUsecase.findSubCategory());
     }
+
+    @Operation(summary = "2차 카테고리 단일 조회")
+    @GetMapping("/sub-categories/{categoryId}")
+    @Secured({"ROLE_USER", "ROLE_MANAGER", "ROLE_ADMIN"})
+    public ResponseEntity<FindSubCategoryResponse> findOneSubCategory(@PathVariable Long categoryId) {
+        return ResponseEntity.ok(findsubCategoryUsecase.findOneSubCategory(categoryId));
+    }
 }
diff --git a/src/main/java/clap/server/adapter/inbound/web/admin/UpdateCategoryController.java b/src/main/java/clap/server/adapter/inbound/web/admin/UpdateCategoryController.java
index ce967a93..80d90d12 100644
--- a/src/main/java/clap/server/adapter/inbound/web/admin/UpdateCategoryController.java
+++ b/src/main/java/clap/server/adapter/inbound/web/admin/UpdateCategoryController.java
@@ -27,6 +27,10 @@ public class UpdateCategoryController {
     @Secured("ROLE_ADMIN")
     public void updateCategory(@AuthenticationPrincipal SecurityUserDetails userInfo, @PathVariable Long categoryId,
                                @Valid @RequestBody UpdateCategoryRequest updateCategoryRequest) {
-        updateCategoryUsecase.updateCategory(userInfo.getUserId(), categoryId, updateCategoryRequest.name(), updateCategoryRequest.code());
+        updateCategoryUsecase.updateCategory(userInfo.getUserId(),
+                categoryId,
+                updateCategoryRequest.name(),
+                updateCategoryRequest.code(),
+                updateCategoryRequest.descriptionExample());
     }
 }
\ No newline at end of file
diff --git a/src/main/java/clap/server/adapter/inbound/web/dto/admin/request/AddSubCategoryRequest.java b/src/main/java/clap/server/adapter/inbound/web/dto/admin/request/AddSubCategoryRequest.java
index 725ae23a..88f2d236 100644
--- a/src/main/java/clap/server/adapter/inbound/web/dto/admin/request/AddSubCategoryRequest.java
+++ b/src/main/java/clap/server/adapter/inbound/web/dto/admin/request/AddSubCategoryRequest.java
@@ -11,5 +11,6 @@ public record AddSubCategoryRequest(
         @NotBlank @Length(max = 20)
         String name,
         @NotBlank @Pattern(regexp = "^[A-Z]{1,2}$", message = "올바른 카테고리 코드 형식이 아닙니다.")
-        String code) {
+        String code,
+        String descriptionExample) {
 }
diff --git a/src/main/java/clap/server/adapter/inbound/web/dto/admin/request/UpdateCategoryRequest.java b/src/main/java/clap/server/adapter/inbound/web/dto/admin/request/UpdateCategoryRequest.java
index 4ec1e751..36a0ecea 100644
--- a/src/main/java/clap/server/adapter/inbound/web/dto/admin/request/UpdateCategoryRequest.java
+++ b/src/main/java/clap/server/adapter/inbound/web/dto/admin/request/UpdateCategoryRequest.java
@@ -8,6 +8,7 @@ public record UpdateCategoryRequest(
         @NotBlank @Length(max = 20)
         String name,
         @NotBlank @Pattern(regexp = "^[A-Z]{1,2}$", message = "올바른 카테고리 코드 형식이 아닙니다.")
-        String code
+        String code,
+        String descriptionExample
 ) {
 }
\ No newline at end of file
diff --git a/src/main/java/clap/server/adapter/inbound/web/dto/admin/response/FindSubCategoryResponse.java b/src/main/java/clap/server/adapter/inbound/web/dto/admin/response/FindSubCategoryResponse.java
index 8993ddb2..5dc588b7 100644
--- a/src/main/java/clap/server/adapter/inbound/web/dto/admin/response/FindSubCategoryResponse.java
+++ b/src/main/java/clap/server/adapter/inbound/web/dto/admin/response/FindSubCategoryResponse.java
@@ -4,6 +4,7 @@ public record FindSubCategoryResponse(
         Long id,
         Long mainCategoryId,
         String name,
-        String code
+        String code,
+        String descriptionExample
 ) {
 }
diff --git a/src/main/java/clap/server/adapter/outbound/persistense/CommentPersistenceAdapter.java b/src/main/java/clap/server/adapter/outbound/persistense/CommentPersistenceAdapter.java
index 427bf08a..7601f9bc 100644
--- a/src/main/java/clap/server/adapter/outbound/persistense/CommentPersistenceAdapter.java
+++ b/src/main/java/clap/server/adapter/outbound/persistense/CommentPersistenceAdapter.java
@@ -34,4 +34,9 @@ public Comment saveComment(Comment comment) {
     public void deleteCommentWithTaskHistory(Long commentId) {
         commentRepository.deleteCommentWithTaskHistory(commentId);
     }
+
+    @Override
+    public void deleteComment(Comment comment) {
+        commentRepository.delete(commentPersistenceMapper.toEntity(comment));
+    }
 }
diff --git a/src/main/java/clap/server/adapter/outbound/persistense/TaskHistoryPersistenceAdapter.java b/src/main/java/clap/server/adapter/outbound/persistense/TaskHistoryPersistenceAdapter.java
index 42a22bde..5ee18b3b 100644
--- a/src/main/java/clap/server/adapter/outbound/persistense/TaskHistoryPersistenceAdapter.java
+++ b/src/main/java/clap/server/adapter/outbound/persistense/TaskHistoryPersistenceAdapter.java
@@ -35,4 +35,9 @@ public TaskHistory save(TaskHistory taskHistory) {
         TaskHistoryEntity savedTaskHistoryEntity = taskHistoryRepository.save(taskHistoryEntity);
         return taskHistoryPersistenceMapper.toDomain(savedTaskHistoryEntity);
     }
+
+    @Override
+    public void deleteTaskHistoryByCommentId(Long commentId) {
+        taskHistoryRepository.updateByComment_CommentId(commentId);
+    }
 }
diff --git a/src/main/java/clap/server/adapter/outbound/persistense/repository/history/TaskHistoryRepository.java b/src/main/java/clap/server/adapter/outbound/persistense/repository/history/TaskHistoryRepository.java
index d5e1cc04..7707a184 100644
--- a/src/main/java/clap/server/adapter/outbound/persistense/repository/history/TaskHistoryRepository.java
+++ b/src/main/java/clap/server/adapter/outbound/persistense/repository/history/TaskHistoryRepository.java
@@ -8,5 +8,8 @@
 import org.springframework.stereotype.Repository;
 
 @Repository
-public interface TaskHistoryRepository extends JpaRepository<TaskHistoryEntity, Long> , TaskHistoryCustomRepository{
-}
\ No newline at end of file
+public interface TaskHistoryRepository extends JpaRepository<TaskHistoryEntity, Long>, TaskHistoryCustomRepository {
+    @Modifying
+    @Query("UPDATE TaskHistoryEntity t SET t.isDeleted = true WHERE t.comment.commentId = :commentId")
+    void updateByComment_CommentId(@Param("commentId") Long commentId);
+}
diff --git a/src/main/java/clap/server/application/mapper/CategoryResponseMapper.java b/src/main/java/clap/server/application/mapper/CategoryResponseMapper.java
index 2b6ba4b7..54f4cf9c 100644
--- a/src/main/java/clap/server/application/mapper/CategoryResponseMapper.java
+++ b/src/main/java/clap/server/application/mapper/CategoryResponseMapper.java
@@ -22,6 +22,6 @@ public static FindMainCategoryResponse toFindMainCategoryResponse(Category categ
     }
 
     public static FindSubCategoryResponse toFindSubCategoryResponse(Category category) {
-        return new FindSubCategoryResponse(category.getCategoryId(), category.getMainCategory().getCategoryId(), category.getName(), category.getCode());
+        return new FindSubCategoryResponse(category.getCategoryId(), category.getMainCategory().getCategoryId(), category.getName(), category.getCode(), category.getDescriptionExample());
     }
 }
diff --git a/src/main/java/clap/server/application/port/inbound/admin/AddSubCategoryUsecase.java b/src/main/java/clap/server/application/port/inbound/admin/AddSubCategoryUsecase.java
index 26df3d7b..0300df03 100644
--- a/src/main/java/clap/server/application/port/inbound/admin/AddSubCategoryUsecase.java
+++ b/src/main/java/clap/server/application/port/inbound/admin/AddSubCategoryUsecase.java
@@ -1,5 +1,5 @@
 package clap.server.application.port.inbound.admin;
 
 public interface AddSubCategoryUsecase {
-    void addSubCategory(Long adminId, Long mainCategoryId, String code, String name);
+    void addSubCategory(Long adminId, Long mainCategoryId, String code, String name, String descriptionExample);
 }
diff --git a/src/main/java/clap/server/application/port/inbound/admin/FindSubCategoryUsecase.java b/src/main/java/clap/server/application/port/inbound/admin/FindSubCategoryUsecase.java
index 5b66dd7d..8428b0c9 100644
--- a/src/main/java/clap/server/application/port/inbound/admin/FindSubCategoryUsecase.java
+++ b/src/main/java/clap/server/application/port/inbound/admin/FindSubCategoryUsecase.java
@@ -6,4 +6,5 @@
 
 public interface FindSubCategoryUsecase {
     List<FindSubCategoryResponse> findSubCategory();
+    FindSubCategoryResponse findOneSubCategory(Long categoryId);
 }
diff --git a/src/main/java/clap/server/application/port/inbound/admin/UpdateCategoryUsecase.java b/src/main/java/clap/server/application/port/inbound/admin/UpdateCategoryUsecase.java
index a4c7b5f6..131626e8 100644
--- a/src/main/java/clap/server/application/port/inbound/admin/UpdateCategoryUsecase.java
+++ b/src/main/java/clap/server/application/port/inbound/admin/UpdateCategoryUsecase.java
@@ -1,5 +1,5 @@
 package clap.server.application.port.inbound.admin;
 
 public interface UpdateCategoryUsecase {
-    void updateCategory(Long adminId, Long categoryId, String name, String code);
+    void updateCategory(Long adminId, Long categoryId, String name, String code, String descriptionExample);
 }
\ No newline at end of file
diff --git a/src/main/java/clap/server/application/port/outbound/task/CommandCommentPort.java b/src/main/java/clap/server/application/port/outbound/task/CommandCommentPort.java
index 71a60c8c..b5087c45 100644
--- a/src/main/java/clap/server/application/port/outbound/task/CommandCommentPort.java
+++ b/src/main/java/clap/server/application/port/outbound/task/CommandCommentPort.java
@@ -7,4 +7,6 @@ public interface CommandCommentPort {
     Comment saveComment(Comment comment);
 
     void deleteCommentWithTaskHistory(Long commentId);
+
+    void deleteComment(Comment comment);
 }
diff --git a/src/main/java/clap/server/application/port/outbound/taskhistory/CommandTaskHistoryPort.java b/src/main/java/clap/server/application/port/outbound/taskhistory/CommandTaskHistoryPort.java
index 9a8b3145..aa6fb800 100644
--- a/src/main/java/clap/server/application/port/outbound/taskhistory/CommandTaskHistoryPort.java
+++ b/src/main/java/clap/server/application/port/outbound/taskhistory/CommandTaskHistoryPort.java
@@ -5,4 +5,6 @@
 
 public interface CommandTaskHistoryPort {
     TaskHistory save(TaskHistory taskHistory);
+
+    void deleteTaskHistoryByCommentId(Long commentId);
 }
diff --git a/src/main/java/clap/server/application/service/admin/AddCategoryService.java b/src/main/java/clap/server/application/service/admin/AddCategoryService.java
index 61f656ca..6a09de2f 100644
--- a/src/main/java/clap/server/application/service/admin/AddCategoryService.java
+++ b/src/main/java/clap/server/application/service/admin/AddCategoryService.java
@@ -36,14 +36,14 @@ public void addMainCategory(Long adminId, String code, String name) {
 
     @Override
     @Transactional
-    public void addSubCategory(Long adminId, Long mainCategoryId, String code, String name) {
+    public void addSubCategory(Long adminId, Long mainCategoryId, String code, String name, String descriptionExample) {
         Optional<Member> activeMember = loadMemberPort.findActiveMemberById(adminId);
         Optional<Category> mainCategory = loadCategoryPort.findById(mainCategoryId);
 
         Category subCategory = Category.createSubCategory(
                 activeMember.orElseThrow(() -> new ApplicationException(ACTIVE_MEMBER_NOT_FOUND)),
                 mainCategory.orElseThrow(() -> new ApplicationException(CATEGORY_NOT_FOUND)),
-                code, name);
+                code, name, descriptionExample);
         commandCategoryPort.save(subCategory);
     }
 }
\ No newline at end of file
diff --git a/src/main/java/clap/server/application/service/admin/FindSubCategoryService.java b/src/main/java/clap/server/application/service/admin/FindSubCategoryService.java
index 9e343fe3..22c59f45 100644
--- a/src/main/java/clap/server/application/service/admin/FindSubCategoryService.java
+++ b/src/main/java/clap/server/application/service/admin/FindSubCategoryService.java
@@ -5,6 +5,8 @@
 import clap.server.application.port.inbound.admin.FindSubCategoryUsecase;
 import clap.server.application.port.outbound.task.LoadCategoryPort;
 import clap.server.common.annotation.architecture.ApplicationService;
+import clap.server.exception.ApplicationException;
+import clap.server.exception.code.TaskErrorCode;
 import lombok.RequiredArgsConstructor;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -16,11 +18,19 @@ public class FindSubCategoryService implements FindSubCategoryUsecase {
     private final LoadCategoryPort loadCategoryPort;
 
     @Override
-    @Transactional
+    @Transactional(readOnly = true)
     public List<FindSubCategoryResponse> findSubCategory() {
         return loadCategoryPort.findSubCategory()
                 .stream()
                 .map(CategoryResponseMapper::toFindSubCategoryResponse)
                 .toList();
     }
+
+    @Override
+    @Transactional(readOnly = true)
+    public FindSubCategoryResponse findOneSubCategory(Long categoryId) {
+        return CategoryResponseMapper.toFindSubCategoryResponse(loadCategoryPort
+                .findById(categoryId)
+                .orElseThrow(() -> new ApplicationException(TaskErrorCode.CATEGORY_NOT_FOUND)));
+    }
 }
diff --git a/src/main/java/clap/server/application/service/admin/UpdateCategoryService.java b/src/main/java/clap/server/application/service/admin/UpdateCategoryService.java
index 23e44ba5..29ac6249 100644
--- a/src/main/java/clap/server/application/service/admin/UpdateCategoryService.java
+++ b/src/main/java/clap/server/application/service/admin/UpdateCategoryService.java
@@ -23,11 +23,11 @@ public class UpdateCategoryService implements UpdateCategoryUsecase {
 
     @Override
     @Transactional
-    public void updateCategory(Long adminId, Long categoryId, String name, String code) {
+    public void updateCategory(Long adminId, Long categoryId, String name, String code, String descriptionExample) {
         Member admin = loadMemberPort.findActiveMemberById(adminId).orElseThrow(() -> new ApplicationException(ACTIVE_MEMBER_NOT_FOUND));
         Category category = loadCategoryPort.findById(categoryId)
                 .orElseThrow(() -> new ApplicationException(CATEGORY_NOT_FOUND));
-        category.updateCategory(admin, name, code);
+        category.updateCategory(admin, name, code, descriptionExample);
         commandCategoryPort.save(category);
     }
 }
\ No newline at end of file
diff --git a/src/main/java/clap/server/application/service/history/CommandCommentService.java b/src/main/java/clap/server/application/service/history/CommandCommentService.java
index 4459a68e..670a3fe8 100644
--- a/src/main/java/clap/server/application/service/history/CommandCommentService.java
+++ b/src/main/java/clap/server/application/service/history/CommandCommentService.java
@@ -55,13 +55,16 @@ public void deleteComment(Long userId, Long commentId) {
         Member member = memberService.findActiveMember(userId);
         Comment comment = commentService.findById(commentId);
 
-        if (Objects.equals(comment.getMember().getMemberId(), member.getMemberId())) {
+        if (Member.checkCommenter(comment.getTask(), member)) {
+            // 첨부파일이 있을 경우 삭제
             if (loadAttachmentPort.exitsByCommentId(commentId)) {
                 deleteAttachments(commentId);
             }
-            commandCommentPort.deleteCommentWithTaskHistory(commentId);
-        }else{
-            throw new DomainException(MemberErrorCode.NOT_A_COMMENTER);
+            // comment 삭제
+            commandCommentPort.deleteComment(comment);
+            // comment와 관련된 taskHistory도 함께 삭제
+
+            commandTaskHistoryPort.deleteTaskHistoryByCommentId(commentId);
         }
     }
 
diff --git a/src/main/java/clap/server/domain/model/task/Category.java b/src/main/java/clap/server/domain/model/task/Category.java
index c544a79e..4f685ce2 100644
--- a/src/main/java/clap/server/domain/model/task/Category.java
+++ b/src/main/java/clap/server/domain/model/task/Category.java
@@ -31,19 +31,21 @@ public static Category createMainCategory(Member admin, String code, String name
                 .build();
     }
 
-    public static Category createSubCategory(Member admin, Category mainCategory, String code, String name) {
+    public static Category createSubCategory(Member admin, Category mainCategory, String code, String name, String descriptionExample) {
         return Category.builder()
                 .mainCategory(mainCategory)
                 .admin(admin)
                 .code(code)
                 .name(name)
+                .descriptionExample(descriptionExample != null ? descriptionExample : "")
                 .build();
     }
 
-    public void updateCategory(Member admin, String name, String code){
+    public void updateCategory(Member admin, String name, String code, String descriptionExample){
         this.admin = admin;
         this.name = name;
         this.code = code;
+        this.descriptionExample = descriptionExample != null ? descriptionExample : "";
     }
 
     public void deleteCategory(Member admin) {
diff --git a/src/test/java/clap/server/application/service/admin/AddCategoryServiceTest.java b/src/test/java/clap/server/application/service/admin/AddCategoryServiceTest.java
index 83e7fb18..783e00ee 100644
--- a/src/test/java/clap/server/application/service/admin/AddCategoryServiceTest.java
+++ b/src/test/java/clap/server/application/service/admin/AddCategoryServiceTest.java
@@ -70,7 +70,8 @@ void addMainCategory() {
     @Test
     void addSubCategory() {
         MemberEntity admin = entityManager.find(MemberEntity.class, 1);
-        addCategoryService.addSubCategory(admin.getMemberId(), 1L, "CR", "생성");
+        addCategoryService.addSubCategory(admin.getMemberId(), 1L,
+                "CR", "생성", "vm이름:\n이미지:\n인스턴스 유형\n볼륨 용량\nvpc이름:\n보안그룸:");
 
         CategoryEntity category = entityManager.find(CategoryEntity.class, 2);
         assertThat(category.getCategoryId()).isEqualTo(2);