diff --git a/src/features/order/constants/order-error-messages.ts b/src/features/order/constants/order-error-messages.ts
index bde6a43..6714e25 100644
--- a/src/features/order/constants/order-error-messages.ts
+++ b/src/features/order/constants/order-error-messages.ts
@@ -6,6 +6,8 @@ export const ORDER_CHECKOUT_ERRORS = {
   DUPLICATE_OPTION_ITEM: '중복된 옵션 선택입니다.',
   INVALID_OPTION_ITEM: '해당 상품의 옵션이 아닙니다.',
   OPTION_GROUP_RULE_VIOLATION: '옵션 그룹의 선택 규칙을 충족하지 않습니다.',
+  OPTION_CUSTOMIZATION_REQUIRED:
+    '커스텀 정보가 필요한 옵션은 아직 주문할 수 없습니다.',
   PICKUP_NOT_AVAILABLE: '선택한 픽업 일시는 예약할 수 없습니다.',
   ORDER_AMOUNT_OUT_OF_RANGE: '주문 금액이 처리 가능한 범위를 벗어났습니다.',
   UNSUPPORTED_CURRENCY: 'KRW 상품만 주문할 수 있습니다.',
diff --git a/src/features/order/services/order-checkout.service.spec.ts b/src/features/order/services/order-checkout.service.spec.ts
index 00fc208..b69e8d8 100644
--- a/src/features/order/services/order-checkout.service.spec.ts
+++ b/src/features/order/services/order-checkout.service.spec.ts
@@ -313,6 +313,42 @@ describe('OrderCheckoutService (real DB)', () => {
       ).rejects.toThrow(BadRequestException);
     });
 
+    it('설명/이미지 필수 옵션 선택은 커스텀 확장 전까지 거절한다', async () => {
+      const store = await makeOpenStore();
+      const product = await createProduct(prisma, { store_id: store.id });
+      const group = await prisma.productOptionGroup.create({
+        data: {
+          product_id: product.id,
+          name: '레터링',
+          is_required: false,
+          min_select: 1,
+          max_select: 1,
+          option_requires_description: true,
+        },
+      });
+      const item = await prisma.productOptionItem.create({
+        data: { option_group_id: group.id, title: '문구 입력', price_delta: 0 },
+      });
+      const buyer = await makeBuyer();
+
+      await expect(
+        service.createOrder(
+          buyer.id,
+          baseInput({
+            productId: product.id.toString(),
+            optionItemIds: [item.id.toString()],
+          }),
+        ),
+      ).rejects.toThrow(BadRequestException);
+
+      // 해당 그룹을 선택하지 않으면 주문 가능(선택 그룹이므로)
+      const ok = await service.createOrder(
+        buyer.id,
+        baseInput({ productId: product.id.toString() }),
+      );
+      expect(ok.status).toBe('SUBMITTED');
+    });
+
     it('없거나 비활성 상품·비활성 매장 상품은 NOT_FOUND다', async () => {
       const buyer = await makeBuyer();
       const inactiveStore = await createStore(prisma, { is_active: false });
diff --git a/src/features/order/services/order-checkout.service.ts b/src/features/order/services/order-checkout.service.ts
index 6f2a04d..814c857 100644
--- a/src/features/order/services/order-checkout.service.ts
+++ b/src/features/order/services/order-checkout.service.ts
@@ -220,6 +220,16 @@ export class OrderCheckoutService {
           ORDER_CHECKOUT_ERRORS.OPTION_GROUP_RULE_VIOLATION,
         );
       }
+      // 설명/이미지 필수 옵션은 커스텀 입력 없이는 판매자 요구 정보가 빠진 채
+      // 주문된다 — 커스텀 체크아웃 확장 전까지 해당 옵션 선택은 거절한다
+      if (
+        count > 0 &&
+        (group.option_requires_description || group.option_requires_image)
+      ) {
+        throw new BadRequestException(
+          ORDER_CHECKOUT_ERRORS.OPTION_CUSTOMIZATION_REQUIRED,
+        );
+      }
     }
     return selections;
   }
diff --git a/src/features/product/repositories/product.repository.ts b/src/features/product/repositories/product.repository.ts
index 3c300be..bd94260 100644
--- a/src/features/product/repositories/product.repository.ts
+++ b/src/features/product/repositories/product.repository.ts
@@ -79,6 +79,9 @@ export interface ProductDetailRow {
     is_required: boolean;
     min_select: number;
     max_select: number;
+    // 주문 생성(checkout)의 커스텀 필수 옵션 가드용
+    option_requires_description: boolean;
+    option_requires_image: boolean;
     sort_order: number;
     option_items: {
       id: bigint;
@@ -923,6 +926,8 @@ export class ProductRepository {
             is_required: true,
             min_select: true,
             max_select: true,
+            option_requires_description: true,
+            option_requires_image: true,
             sort_order: true,
             option_items: {
               where: { is_active: true, deleted_at: null },