diff --git a/src/pages/instructor/classRegister/ClassRegister.tsx b/src/pages/instructor/classRegister/ClassRegister.tsx
index 20b11990..b7526b9b 100644
--- a/src/pages/instructor/classRegister/ClassRegister.tsx
+++ b/src/pages/instructor/classRegister/ClassRegister.tsx
@@ -157,17 +157,18 @@ const ClassRegister = () => {
 
   const handleLocationCheckboxClick = () => {
     handleNoneLocationCheck();
+    setValue('isUndecidedLocation', !isUndecidedLocation, { shouldValidate: true, shouldDirty: true });
     clearErrors('selectedLocation');
   };
 
   const handleAddTime = () => {
     const newTimes = originalHandleAddTime();
-    setValue('times', newTimes, { shouldValidate: true });
+    setValue('times', newTimes, { shouldValidate: true, shouldDirty: true });
   };
 
   const handleRemoveTime = (idx: number) => {
     const newTimes = originalHandleRemoveTime(idx);
-    setValue('times', newTimes, { shouldValidate: true });
+    setValue('times', newTimes, { shouldValidate: true, shouldDirty: true });
   };
 
   const initTimeAndOpenBottomSheet = () => {
diff --git a/src/pages/instructor/classRegister/hooks/useClassEditMode.ts b/src/pages/instructor/classRegister/hooks/useClassEditMode.ts
index 6155e1f3..3d729315 100644
--- a/src/pages/instructor/classRegister/hooks/useClassEditMode.ts
+++ b/src/pages/instructor/classRegister/hooks/useClassEditMode.ts
@@ -115,6 +115,14 @@ export const useClassEditMode = ({
     });
 
     // 외부 state 업데이트
-    updateExternalStates(lessonData, formattedTimes, locationData, setImageUrls, setTimes, setSelectedLocation, setIsUndecidedLocation);
+    updateExternalStates(
+      lessonData,
+      formattedTimes,
+      locationData,
+      setImageUrls,
+      setTimes,
+      setSelectedLocation,
+      setIsUndecidedLocation
+    );
   }, [isEditMode, lessonData, reset, setImageUrls, setTimes, setSelectedLocation, setIsUndecidedLocation]);
 };