diff --git a/src/views/Chat/CharacterForm.vue b/src/views/Chat/CharacterForm.vue
index c8af1b1..e2dd4b1 100644
--- a/src/views/Chat/CharacterForm.vue
+++ b/src/views/Chat/CharacterForm.vue
@@ -270,6 +270,7 @@
                   outlined
                   auto-grow
                   rows="4"
+                  :rules="systemPromptRules"
                 />
                 <div
                   class="caption grey--text text--darken-1 mt-1 custom-caption"
@@ -908,10 +909,10 @@
             <v-btn
               color="primary"
               :loading="isLoading"
-              :disabled="!isFormValid || isLoading"
+              :disabled="isSaveDisabled"
               @click="saveCharacter"
             >
-              저장
+              {{ isEdit ? '수정' : '저장' }}
             </v-btn>
           </v-card-actions>
         </v-form>
@@ -994,7 +995,7 @@ export default {
         v => (v && v.trim().length > 0) || '한 줄 소개를 입력하세요'
       ],
       imageRules: [
-        v => !this.isEdit || !!v || !!this.character.imageUrl || '이미지를 선택하세요'
+        v => (this.isEdit ? true : (!!v || '이미지를 선택하세요'))
       ],
       genderOptions: ['남성', '여성', '기타'],
       mbtiOptions: [
@@ -1003,11 +1004,25 @@ export default {
         'ISTJ', 'ISFJ', 'ESTJ', 'ESFJ',
         'ISTP', 'ISFP', 'ESTP', 'ESFP'
       ],
-      typeOptions: ['Clone', 'Character']
+      typeOptions: ['Clone', 'Character'],
+      systemPromptRules: [
+        v => (this.isEdit ? true : (!!v && v.trim().length > 0) || '시스템 프롬프트를 입력하세요')
+      ]
     }
   },
 
   computed: {
+    isSaveDisabled() {
+      if (this.isLoading) return true;
+      if (!this.isFormValid) return true;
+      if (!this.isEdit) return false; // 등록 시에는 변경 감지 없이 유효성만 확인
+
+      // 수정 시에는 변경 사항이 있는 경우에만 저장 가능
+      const changed = this.getChangedFields();
+      const hasNonIdField = Object.keys(changed || {}).some(k => k !== 'id');
+      const imageChanged = !!this.character.image; // 새 이미지 선택 여부
+      return !(hasNonIdField || imageChanged);
+    }
   },
 
   watch: {