diff --git a/backend/src/main/java/com/openisle/controller/AuthController.java b/backend/src/main/java/com/openisle/controller/AuthController.java
index 682a613c6..b27d8eeb5 100644
--- a/backend/src/main/java/com/openisle/controller/AuthController.java
+++ b/backend/src/main/java/com/openisle/controller/AuthController.java
@@ -17,7 +17,6 @@ import com.openisle.exception.FieldException;
 import lombok.Data;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
-import org.springframework.security.core.Authentication;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.beans.factory.annotation.Value;
 import java.util.Map;
@@ -155,7 +154,7 @@ public class AuthController {
             ));
         }
 
-        if (req.reason == null || req.reason.length() <= 20) {
+        if (req.getReason() == null || req.getReason().length() <= 20) {
             return ResponseEntity.badRequest().body(Map.of(
                     "error", "Reason's length must longer than 20",
                     "reason_code", "INVALID_CREDENTIALS"
diff --git a/backend/src/main/java/com/openisle/controller/CommentController.java b/backend/src/main/java/com/openisle/controller/CommentController.java
index d4542d999..72e4c6571 100644
--- a/backend/src/main/java/com/openisle/controller/CommentController.java
+++ b/backend/src/main/java/com/openisle/controller/CommentController.java
@@ -1,6 +1,10 @@
 package com.openisle.controller;
 
 import com.openisle.model.Comment;
+import com.openisle.dto.CommentDto;
+import com.openisle.dto.CommentRequest;
+import com.openisle.mapper.CommentMapper;
+import com.openisle.service.CaptchaService;
 import com.openisle.service.CommentService;
 import com.openisle.service.CaptchaService;
 import com.openisle.service.LevelService;