diff --git a/src/main/java/com/moplus/moplus_server/domain/problem/dto/request/ChildProblemUpdateRequest.java b/src/main/java/com/moplus/moplus_server/domain/problem/dto/request/ChildProblemUpdateRequest.java
index 7ae28f0..0d4e088 100644
--- a/src/main/java/com/moplus/moplus_server/domain/problem/dto/request/ChildProblemUpdateRequest.java
+++ b/src/main/java/com/moplus/moplus_server/domain/problem/dto/request/ChildProblemUpdateRequest.java
@@ -6,6 +6,7 @@
 import java.util.Set;
 
 public record ChildProblemUpdateRequest(
+        @NotNull(message = "새끼문제 ID는 필수입니다.")
         Long childProblemId,
         String imageUrl,
         AnswerType answerType,
diff --git a/src/main/java/com/moplus/moplus_server/domain/problemset/controller/ProblemSetController.java b/src/main/java/com/moplus/moplus_server/domain/problemset/controller/ProblemSetController.java
index 5e2c2fd..80aaffb 100644
--- a/src/main/java/com/moplus/moplus_server/domain/problemset/controller/ProblemSetController.java
+++ b/src/main/java/com/moplus/moplus_server/domain/problemset/controller/ProblemSetController.java
@@ -45,7 +45,7 @@ public ResponseEntity<IdResponse> createProblemSet(
     @PutMapping("/{problemSetId}/sequence")
     @Operation(summary = "세트 문항순서 변경", description = "문항세트 내의 문항 리스트의 순서를 변경합니다.")
     public ResponseEntity<Void> reorderProblems(
-            @PathVariable Long problemSetId,
+            @PathVariable("problemSetId") Long problemSetId,
             @RequestBody ProblemReorderRequest request) {
         problemSetUpdateService.reorderProblems(problemSetId, request);
         return ResponseEntity.noContent().build();
@@ -54,7 +54,7 @@ public ResponseEntity<Void> reorderProblems(
     @PutMapping("/{problemSetId}")
     @Operation(summary = "문항세트 수정", description = "문항세트의 이름 및 문항 리스트를 수정합니다.")
     public ResponseEntity<Void> updateProblemSet(
-            @PathVariable Long problemSetId,
+            @PathVariable("problemSetId") Long problemSetId,
             @RequestBody ProblemSetUpdateRequest request
     ) {
         problemSetUpdateService.updateProblemSet(problemSetId, request);
@@ -64,7 +64,7 @@ public ResponseEntity<Void> updateProblemSet(
     @DeleteMapping("/{problemSetId}")
     @Operation(summary = "문항세트 삭제", description = "문항세트를 삭제합니다. (soft delete)")
     public ResponseEntity<Void> deleteProblemSet(
-            @PathVariable Long problemSetId
+            @PathVariable("problemSetId") Long problemSetId
     ) {
         problemSetDeleteService.deleteProblemSet(problemSetId);
         return ResponseEntity.ok(null);
@@ -73,7 +73,7 @@ public ResponseEntity<Void> deleteProblemSet(
     @PutMapping("/{problemSetId}/confirm")
     @Operation(summary = "문항세트 컨펌 토글", description = "문항세트의 컨펌 상태를 토글합니다.")
     public ResponseEntity<ProblemSetConfirmStatus> toggleConfirmProblemSet(
-            @PathVariable Long problemSetId
+            @PathVariable("problemSetId") Long problemSetId
     ) {
         return ResponseEntity.ok(problemSetUpdateService.toggleConfirmProblemSet(problemSetId));
     }
diff --git a/src/main/java/com/moplus/moplus_server/domain/problemset/domain/ProblemSet.java b/src/main/java/com/moplus/moplus_server/domain/problemset/domain/ProblemSet.java
index 012583f..8f8a466 100644
--- a/src/main/java/com/moplus/moplus_server/domain/problemset/domain/ProblemSet.java
+++ b/src/main/java/com/moplus/moplus_server/domain/problemset/domain/ProblemSet.java
@@ -95,4 +95,20 @@ public void updateProblemSet(String title, List<Long> newProblems) {
         this.title = new Title(title);
         this.problemIds = newProblems;
     }
+
+    public boolean isConfirmed() {
+        return this.confirmStatus == ProblemSetConfirmStatus.CONFIRMED;
+    }
+
+    public boolean isProblemsChanged(List<Long> newProblems) {
+        if (this.problemIds.size() != newProblems.size()) {
+            return true;
+        }
+        for (int i = 0; i < this.problemIds.size(); i++) {
+            if (!this.problemIds.get(i).equals(newProblems.get(i))) {
+                return true;
+            }
+        }
+        return false;
+    }
 }
diff --git a/src/main/java/com/moplus/moplus_server/domain/problemset/service/ProblemSetUpdateService.java b/src/main/java/com/moplus/moplus_server/domain/problemset/service/ProblemSetUpdateService.java
index 10c52c9..a82727d 100644
--- a/src/main/java/com/moplus/moplus_server/domain/problemset/service/ProblemSetUpdateService.java
+++ b/src/main/java/com/moplus/moplus_server/domain/problemset/service/ProblemSetUpdateService.java
@@ -29,6 +29,9 @@ public class ProblemSetUpdateService {
     @Transactional
     public void reorderProblems(Long problemSetId, ProblemReorderRequest request) {
         ProblemSet problemSet = problemSetRepository.findByIdElseThrow(problemSetId);
+        if (problemSet.isConfirmed()) {
+            throw new InvalidValueException(ErrorCode.CONFIRMED_PROBLEM_SET_REORDER_ERROR);
+        }
 
         problemSet.updateProblemOrder(request.newProblems());
     }
@@ -39,7 +42,11 @@ public void updateProblemSet(Long problemSetId, ProblemSetUpdateRequest request)
         if (problemSet.isDeleted()) {
             throw new BusinessException(ErrorCode.DELETE_PROBLEM_SET_UPDATE_ERROR);
         }
-        // 빈 문항 유효성 검증
+
+        if (problemSet.isConfirmed() && problemSet.isProblemsChanged(request.problemIds())) {
+            throw new InvalidValueException(ErrorCode.CONFIRMED_PROBLEM_SET_UPDATE_ERROR);
+        }
+
         if (request.problemIds().isEmpty()) {
             throw new InvalidValueException(ErrorCode.EMPTY_PROBLEMS_ERROR);
         }
diff --git a/src/main/java/com/moplus/moplus_server/global/error/exception/ErrorCode.java b/src/main/java/com/moplus/moplus_server/global/error/exception/ErrorCode.java
index f511f7c..52a7fa0 100644
--- a/src/main/java/com/moplus/moplus_server/global/error/exception/ErrorCode.java
+++ b/src/main/java/com/moplus/moplus_server/global/error/exception/ErrorCode.java
@@ -65,6 +65,8 @@ public enum ErrorCode {
     DELETE_PROBLEM_SET_GET_ERROR(HttpStatus.BAD_REQUEST, "삭제된 세트 문항은 조회할 수 없습니다."),
     DELETE_PROBLEM_SET_UPDATE_ERROR(HttpStatus.BAD_REQUEST, "삭제된 세트 문항은 수정할 수 없습니다."),
     DELETE_PROBLEM_SET_TOGGLE_ERROR(HttpStatus.BAD_REQUEST, "삭제된 세트 문항은 컨펌을 토글할 수 없습니다."),
+    CONFIRMED_PROBLEM_SET_REORDER_ERROR(HttpStatus.BAD_REQUEST, "컨펌된 세트 문항은 문항 순서를 변경할 수 없습니다."),
+    CONFIRMED_PROBLEM_SET_UPDATE_ERROR(HttpStatus.BAD_REQUEST, "컨펌된 세트 문항은 수정할 수 없습니다."),
 
     // 발행
     INVALID_MONTH_ERROR(HttpStatus.BAD_REQUEST, "유효하지 않은 월입니다."),