diff --git a/src/main/java/com/codeit/todo/service/complete/CompleteService.java b/src/main/java/com/codeit/todo/service/complete/CompleteService.java
index 6482ada..b680446 100644
--- a/src/main/java/com/codeit/todo/service/complete/CompleteService.java
+++ b/src/main/java/com/codeit/todo/service/complete/CompleteService.java
@@ -7,5 +7,5 @@
 public interface CompleteService {
     UpdateCompleteResponse updateCompleteInfo(int userId, int completeId, UpdateCompleteRequest request);
 
-    ReadCompleteDetailResponse readComplete(int userId, int completeId);
+    ReadCompleteDetailResponse readComplete(int completeId, int userId);
 }
diff --git a/src/main/java/com/codeit/todo/service/complete/impl/CompleteServiceImpl.java b/src/main/java/com/codeit/todo/service/complete/impl/CompleteServiceImpl.java
index 570d564..55b074c 100644
--- a/src/main/java/com/codeit/todo/service/complete/impl/CompleteServiceImpl.java
+++ b/src/main/java/com/codeit/todo/service/complete/impl/CompleteServiceImpl.java
@@ -44,8 +44,9 @@ public UpdateCompleteResponse updateCompleteInfo(int userId, int completeId, Upd
 
     @Transactional(readOnly = true)
     @Override
-    public ReadCompleteDetailResponse readComplete(int userId, int completeId) {
-        Complete complete = getComplete(userId, completeId);
+    public ReadCompleteDetailResponse readComplete(int completeId, int userId) {
+        Complete complete = completeRepository.findById(completeId)
+                .orElseThrow(() -> new CompleteNotFoundException(String.valueOf(completeId)));
         List<ReadCommentResponse> commentResponses = complete.getComments().stream()
                 .map(ReadCommentResponse::fromEntity)
                 .toList();
diff --git a/src/main/java/com/codeit/todo/web/controller/CompleteController.java b/src/main/java/com/codeit/todo/web/controller/CompleteController.java
index 5b71b94..95be0dd 100644
--- a/src/main/java/com/codeit/todo/web/controller/CompleteController.java
+++ b/src/main/java/com/codeit/todo/web/controller/CompleteController.java
@@ -51,6 +51,6 @@ public Response<ReadCompleteDetailResponse> readComplete(
             @PathVariable int completeId
     ) {
         int userId = userDetails.getUserId();
-        return Response.ok(completeService.readComplete(userId, completeId));
+        return Response.ok(completeService.readComplete(completeId, userId));
     }
 }