diff --git a/src/hooks/__tests__/useAdminAlcohols.test.ts b/src/hooks/__tests__/useAdminAlcohols.test.ts
index 3166081..843dbab 100644
--- a/src/hooks/__tests__/useAdminAlcohols.test.ts
+++ b/src/hooks/__tests__/useAdminAlcohols.test.ts
@@ -5,7 +5,7 @@ import { server } from '@/test/mocks/server';
 import { renderHook } from '@/test/test-utils';
 import { wrapApiError } from '@/test/mocks/data';
 import { useAdminAlcoholList, useCategoryReferences } from '../useAdminAlcohols';
-import { getCategoryGroup } from '@/types/api/alcohol.api';
+import { useCategoryGroupMap } from '../useCategoryGroupMap';
 
 const BASE = '/admin/api/v1/alcohols';
 
@@ -89,10 +89,13 @@ describe('useAdminAlcohols hooks', () => {
 });
 
   // ==========================================
-  // getCategoryGroup (프론트엔드 매핑)
+  // useCategoryGroupMap (카테고리 그룹 매핑 훅)
   // ==========================================
-  describe('getCategoryGroup', () => {
+  describe('useCategoryGroupMap', () => {
     it('메인 카테고리를 올바른 그룹으로 매핑한다', () => {
+      const { result } = renderHook(() => useCategoryGroupMap());
+      const { getCategoryGroup } = result.current;
+
       expect(getCategoryGroup('싱글 몰트')).toBe('SINGLE_MALT');
       expect(getCategoryGroup('블렌디드')).toBe('BLEND');
       expect(getCategoryGroup('블렌디드 몰트')).toBe('BLENDED_MALT');
@@ -100,11 +103,10 @@ describe('useAdminAlcohols hooks', () => {
       expect(getCategoryGroup('라이')).toBe('RYE');
     });
 
-    it('싱글몰트 알코올 변형도 SINGLE_MALT로 매핑한다', () => {
-      expect(getCategoryGroup('싱글몰트 알코올')).toBe('SINGLE_MALT');
-    });
-
     it('기타 하위 카테고리는 OTHER로 매핑한다', () => {
+      const { result } = renderHook(() => useCategoryGroupMap());
+      const { getCategoryGroup } = result.current;
+
       expect(getCategoryGroup('테네시')).toBe('OTHER');
       expect(getCategoryGroup('싱글 그레인')).toBe('OTHER');
       expect(getCategoryGroup('싱글 팟 스틸')).toBe('OTHER');
@@ -114,7 +116,22 @@ describe('useAdminAlcohols hooks', () => {
     });
 
     it('알 수 없는 카테고리도 OTHER로 매핑한다', () => {
-      expect(getCategoryGroup('새로운카테고리')).toBe('OTHER');
+      const { result } = renderHook(() => useCategoryGroupMap());
+      expect(result.current.getCategoryGroup('새로운카테고리')).toBe('OTHER');
+    });
+
+    it('그룹의 대표 카테고리를 반환한다', () => {
+      const { result } = renderHook(() => useCategoryGroupMap());
+      const { getGroupDefaultCategory } = result.current;
+
+      expect(getGroupDefaultCategory('SINGLE_MALT')).toEqual({
+        korCategory: '싱글 몰트',
+        engCategory: 'Single Malt',
+      });
+      expect(getGroupDefaultCategory('BLEND')).toEqual({
+        korCategory: '블렌디드',
+        engCategory: 'Blend',
+      });
     });
   });
 });
diff --git a/src/hooks/useCategoryGroupMap.ts b/src/hooks/useCategoryGroupMap.ts
new file mode 100644
index 0000000..5f7f27e
--- /dev/null
+++ b/src/hooks/useCategoryGroupMap.ts
@@ -0,0 +1,37 @@
+/**
+ * 카테고리 그룹 매핑 훅
+ * GROUPED_CATEGORY_REFERENCES(단일 소스)에서 카테고리 ↔ 그룹 매핑을 파생.
+ * TODO: #221 API 반영 시 내부 데이터 소스를 React Query로 교체
+ */
+
+import {
+  GROUPED_CATEGORY_REFERENCES,
+  type AlcoholCategory,
+  type CategoryReference,
+} from '@/types/api';
+
+const categoryToGroupMap = new Map<string, AlcoholCategory>(
+  Object.entries(GROUPED_CATEGORY_REFERENCES).flatMap(([group, refs]) =>
+    refs.map((ref) => [ref.korCategory, group as AlcoholCategory] as const)
+  )
+);
+
+export function useCategoryGroupMap() {
+  // TODO: #221 반영 시 useGroupedCategoryReferences() React Query 데이터로 교체
+  const categoryReferencesByGroup = GROUPED_CATEGORY_REFERENCES;
+
+  const getCategoryGroup = (korCategory: string): AlcoholCategory =>
+    categoryToGroupMap.get(korCategory) ?? 'OTHER';
+
+  const getGroupDefaultCategory = (
+    group: Exclude<AlcoholCategory, 'OTHER'>
+  ): CategoryReference => {
+    const ref = categoryReferencesByGroup[group][0];
+    if (!ref) {
+      throw new Error(`No category reference found for group: ${group}`);
+    }
+    return ref;
+  };
+
+  return { getCategoryGroup, getGroupDefaultCategory, categoryReferencesByGroup };
+}
diff --git a/src/pages/whisky/WhiskyDetail.tsx b/src/pages/whisky/WhiskyDetail.tsx
index ee4414d..a087758 100644
--- a/src/pages/whisky/WhiskyDetail.tsx
+++ b/src/pages/whisky/WhiskyDetail.tsx
@@ -23,6 +23,7 @@ import {
 import { useWhiskyDetailForm } from './useWhiskyDetailForm';
 import { useImageUpload, S3UploadPath } from '@/hooks/useImageUpload';
 import { useTastingTagList } from '@/hooks/useTastingTags';
+import { useToast } from '@/hooks/useToast';
 
 import type { AlcoholTastingTag } from '@/types/api';
 
@@ -45,6 +46,9 @@ export function WhiskyDetailPage() {
     handleDelete,
   } = useWhiskyDetailForm(id);
 
+  // Toast 알림
+  const { showToast } = useToast();
+
   // 이미지 업로드 훅
   const { upload: uploadImage, isUploading: isImageUploading } = useImageUpload({
     rootPath: S3UploadPath.ALCOHOL,
@@ -94,6 +98,9 @@ export function WhiskyDetailPage() {
     (data) => {
       onSubmit(data, { tastingTags, relatedKeywords, imagePreviewUrl });
     },
+    () => {
+      showToast({ type: 'warning', message: '입력 정보를 확인해주세요.' });
+    },
   );
 
   const handleDeleteConfirm = () => {
diff --git a/src/pages/whisky/WhiskyList.tsx b/src/pages/whisky/WhiskyList.tsx
index 15586f6..839017f 100644
--- a/src/pages/whisky/WhiskyList.tsx
+++ b/src/pages/whisky/WhiskyList.tsx
@@ -31,7 +31,7 @@ import { Badge } from '@/components/ui/badge';
 import { Pagination } from '@/components/common/Pagination';
 import { useAdminAlcoholList } from '@/hooks/useAdminAlcohols';
 import type { AlcoholSearchParams, AlcoholCategory } from '@/types/api';
-import { ALCOHOL_CATEGORIES, CATEGORY_GROUP_LABELS, getCategoryGroup } from '@/types/api';
+import { ALCOHOL_CATEGORIES, CATEGORY_GROUP_LABELS } from '@/types/api';
 
 const CATEGORY_OPTIONS: { value: AlcoholCategory | 'ALL'; label: string }[] = [
   { value: 'ALL', label: '전체' },
@@ -245,14 +245,7 @@ export function WhiskyListPage() {
                     <TableCell className="text-muted-foreground">
                       {item.engName}
                     </TableCell>
-                    <TableCell>
-                      <div className="flex flex-col gap-0.5">
-                        <span>{item.korCategoryName}</span>
-                        <span className="text-xs text-muted-foreground">
-                          {CATEGORY_GROUP_LABELS[getCategoryGroup(item.korCategoryName)]}
-                        </span>
-                      </div>
-                    </TableCell>
+                    <TableCell>{item.korCategoryName}</TableCell>
                     <TableCell className="text-sm text-muted-foreground">
                       {new Date(item.modifiedAt).toLocaleDateString('ko-KR')}
                     </TableCell>
diff --git a/src/pages/whisky/components/WhiskyBasicInfoCard.tsx b/src/pages/whisky/components/WhiskyBasicInfoCard.tsx
index 60b8e74..00230fe 100644
--- a/src/pages/whisky/components/WhiskyBasicInfoCard.tsx
+++ b/src/pages/whisky/components/WhiskyBasicInfoCard.tsx
@@ -20,7 +20,8 @@ import { SearchableSelect } from '@/components/common/SearchableSelect';
 
 import type { WhiskyFormValues } from '../whisky.schema';
 import type { AlcoholCategory, CategoryReference } from '@/types/api';
-import { ALCOHOL_CATEGORIES, CATEGORY_GROUP_LABELS, GROUP_TO_CATEGORY } from '@/types/api';
+import { ALCOHOL_CATEGORIES, CATEGORY_GROUP_LABELS } from '@/types/api';
+import { useCategoryGroupMap } from '@/hooks/useCategoryGroupMap';
 
 /**
  * WhiskyBasicInfoCard 컴포넌트의 props
@@ -46,6 +47,7 @@ export function WhiskyBasicInfoCard({
 }: WhiskyBasicInfoCardProps) {
   const { register, watch, setValue, formState } = form;
   const { errors } = formState;
+  const { getGroupDefaultCategory, categoryReferencesByGroup } = useCategoryGroupMap();
 
   const regionOptions = regions.map((region) => ({ value: String(region.id), label: region.korName }));
   const distilleryOptions = distilleries.map((distillery) => ({ value: String(distillery.id), label: distillery.korName }));
@@ -54,7 +56,11 @@ export function WhiskyBasicInfoCard({
   const isOtherCategory = currentCategoryGroup === 'OTHER';
 
   // OTHER일 때 기존 서브카테고리 옵션 (CategoryReference API에서 메인 그룹 제외)
-  const mainKorCategories = new Set(Object.values(GROUP_TO_CATEGORY).map((c) => c.korCategory));
+  const mainKorCategories = new Set(
+    Object.entries(categoryReferencesByGroup)
+      .filter(([group]) => group !== 'OTHER')
+      .flatMap(([, refs]) => refs.map((r) => r.korCategory))
+  );
   const otherCategoryOptions = categories
     .filter((cat) => !mainKorCategories.has(cat.korCategory))
     .map((cat) => ({ value: cat.korCategory, label: `${cat.korCategory} (${cat.engCategory})` }));
@@ -63,7 +69,7 @@ export function WhiskyBasicInfoCard({
   const handleCategoryGroupChange = (group: AlcoholCategory) => {
     setValue('categoryGroup', group);
     if (group !== 'OTHER') {
-      const mapped = GROUP_TO_CATEGORY[group];
+      const mapped = getGroupDefaultCategory(group);
       setValue('korCategory', mapped.korCategory);
       setValue('engCategory', mapped.engCategory);
     } else {
diff --git a/src/pages/whisky/useWhiskyDetailForm.ts b/src/pages/whisky/useWhiskyDetailForm.ts
index 2ab7ad0..69689ba 100644
--- a/src/pages/whisky/useWhiskyDetailForm.ts
+++ b/src/pages/whisky/useWhiskyDetailForm.ts
@@ -22,13 +22,15 @@ import { useDistilleryList } from '@/hooks/useDistilleries';
 import { whiskyFormSchema } from './whisky.schema';
 import type { WhiskyFormValues } from './whisky.schema';
 import type { AlcoholCreateRequest, AlcoholUpdateRequest, AlcoholTastingTag, CategoryReference } from '@/types/api';
+import { GROUPED_CATEGORY_REFERENCES } from '@/types/api';
 
 /** 신규 등록용 폼 기본값 */
+const defaultCategory = GROUPED_CATEGORY_REFERENCES.SINGLE_MALT[0]!;
 const DEFAULT_WHISKY_FORM: WhiskyFormValues = {
   korName: '',
   engName: '',
-  korCategory: '',
-  engCategory: '',
+  korCategory: defaultCategory.korCategory,
+  engCategory: defaultCategory.engCategory,
   categoryGroup: 'SINGLE_MALT',
   regionId: 0,
   distilleryId: 0,
diff --git a/src/types/api/alcohol.api.ts b/src/types/api/alcohol.api.ts
index ff6459c..46b2a00 100644
--- a/src/types/api/alcohol.api.ts
+++ b/src/types/api/alcohol.api.ts
@@ -365,37 +365,18 @@ export const CATEGORY_GROUP_LABELS: Record<AlcoholCategory, string> = {
 export const ALCOHOL_CATEGORIES: AlcoholCategory[] = Object.keys(CATEGORY_GROUP_LABELS) as AlcoholCategory[];
 
 /**
- * korCategory → categoryGroup 매핑
- * 메인 5개 그룹에 해당하는 카테고리만 명시, 나머지는 모두 OTHER
+ * 그룹별 카테고리 레퍼런스 (단일 소스)
+ * 현재는 하드코딩이지만, #221 API 반영 시 서버 응답으로 교체 예정.
+ * 서버 응답 형태: Record<AlcoholCategory, CategoryReference[]>
  */
-const CATEGORY_TO_GROUP_MAP: Record<string, AlcoholCategory> = {
-  '싱글 몰트': 'SINGLE_MALT',
-  '싱글몰트 알코올': 'SINGLE_MALT',
-  '블렌디드': 'BLEND',
-  '블렌디드 몰트': 'BLENDED_MALT',
-  '버번': 'BOURBON',
-  '라이': 'RYE',
-};
-
-/**
- * korCategory 문자열로부터 categoryGroup을 결정한다.
- * CategoryReference API가 categoryGroup을 내려주지 않으므로 프론트에서 매핑.
- * 메인 5개 그룹에 해당하지 않으면 OTHER로 분류.
- */
-export function getCategoryGroup(korCategory: string): AlcoholCategory {
-  return CATEGORY_TO_GROUP_MAP[korCategory] ?? 'OTHER';
-}
-
-/**
- * categoryGroup → 고정 카테고리 이름 매핑 (메인 5개 그룹용)
- * OTHER는 자유 입력이므로 포함하지 않음
- */
-export const GROUP_TO_CATEGORY: Record<Exclude<AlcoholCategory, 'OTHER'>, { korCategory: string; engCategory: string }> = {
-  SINGLE_MALT: { korCategory: '싱글 몰트', engCategory: 'Single Malt' },
-  BLEND: { korCategory: '블렌디드', engCategory: 'Blend' },
-  BLENDED_MALT: { korCategory: '블렌디드 몰트', engCategory: 'Blended Malt' },
-  BOURBON: { korCategory: '버번', engCategory: 'Bourbon' },
-  RYE: { korCategory: '라이', engCategory: 'Rye' },
+// TODO: #221 API 반영 시 서버 응답으로 교체
+export const GROUPED_CATEGORY_REFERENCES: Record<AlcoholCategory, CategoryReference[]> = {
+  SINGLE_MALT: [{ korCategory: '싱글 몰트', engCategory: 'Single Malt' }],
+  BLEND: [{ korCategory: '블렌디드', engCategory: 'Blend' }],
+  BLENDED_MALT: [{ korCategory: '블렌디드 몰트', engCategory: 'Blended Malt' }],
+  BOURBON: [{ korCategory: '버번', engCategory: 'Bourbon' }],
+  RYE: [{ korCategory: '라이', engCategory: 'Rye' }],
+  OTHER: [],
 };
 
 // ============================================