diff --git a/src/api/lottecinemaHandlers.ts b/src/api/lottecinemaHandlers.ts
index 83cd0b19..72bce4cd 100644
--- a/src/api/lottecinemaHandlers.ts
+++ b/src/api/lottecinemaHandlers.ts
@@ -1,3 +1,4 @@
+import { ServiceError } from '../core/errors.js';
 import { hasInvalidCinemaQuery, CINEMA_INVALID_INPUT } from '../services/cgv/validation.js';
 import { geocodeBindings } from '../utils/geocode.js';
 /**
@@ -9,7 +10,12 @@ import {
   fetchLotteCinemaNearbyTheaters,
   resolveLotteCinemaNearestTheater,
 } from '../services/lottecinema/location.js';
-import { type ApiContext, errorResponse, successResponse } from './response.js';
+import {
+  type ApiContext,
+  errorResponse,
+  serviceErrorResponse,
+  successResponse,
+} from './response.js';
 
 function parseOptionalNumber(value: string | undefined): number | undefined {
   return value === undefined ? undefined : Number(value);
@@ -44,6 +50,7 @@ export async function handleLotteCinemaFindNearbyTheaters(c: ApiContext) {
 
     return successResponse(c, result, { total: result.count, pageSize: limit });
   } catch (error) {
+    if (error instanceof ServiceError) return serviceErrorResponse(c, error, 'lottecinema_request');
     const message = error instanceof Error ? error.message : '알 수 없는 오류가 발생했습니다.';
     return errorResponse(c, 'LOTTECINEMA_THEATER_SEARCH_FAILED', message, 500);
   }
@@ -111,6 +118,7 @@ export async function handleLotteCinemaListNowShowing(c: ApiContext) {
       { total: showtimes.length },
     );
   } catch (error) {
+    if (error instanceof ServiceError) return serviceErrorResponse(c, error, 'lottecinema_request');
     const message = error instanceof Error ? error.message : '알 수 없는 오류가 발생했습니다.';
     return errorResponse(c, 'LOTTECINEMA_MOVIE_LIST_FAILED', message, 500);
   }
@@ -188,6 +196,7 @@ export async function handleLotteCinemaGetRemainingSeats(c: ApiContext) {
       { total: seats.length, pageSize: limit },
     );
   } catch (error) {
+    if (error instanceof ServiceError) return serviceErrorResponse(c, error, 'lottecinema_request');
     const message = error instanceof Error ? error.message : '알 수 없는 오류가 발생했습니다.';
     return errorResponse(c, 'LOTTECINEMA_SEAT_LIST_FAILED', message, 500);
   }
diff --git a/src/services/lottecinema/client.ts b/src/services/lottecinema/client.ts
index 8b194754..6bfdcab8 100644
--- a/src/services/lottecinema/client.ts
+++ b/src/services/lottecinema/client.ts
@@ -1,3 +1,4 @@
+import { ServiceError } from '../../core/errors.js';
 /**
  * 롯데시네마 API 클라이언트
  */
@@ -81,7 +82,18 @@ async function requestLotteCinema<T>(
       throw new Error(`롯데시네마 API 호출 실패: ${response.status}`);
     }
 
-    const parsed = (await response.json()) as { IsOK?: boolean; ResultMessage?: string } & T;
+    const parsed = (await response.json().catch((error: unknown) => {
+      if (error instanceof SyntaxError) {
+        throw new ServiceError(
+          'LOTTECINEMA_INVALID_RESPONSE',
+          '롯데시네마 원본 응답을 읽을 수 없습니다. 잠시 후 다시 조회해주세요.',
+          502,
+          true,
+          response.status,
+        );
+      }
+      throw error;
+    })) as { IsOK?: boolean; ResultMessage?: string } & T;
     if (parsed.IsOK === false) {
       throw new Error(`롯데시네마 API 응답 실패: ${parsed.ResultMessage || 'UNKNOWN'}`);
     }
@@ -207,9 +219,7 @@ async function fetchPlaySequenceByPair(
     });
 }
 
-export async function fetchLotteCinemaNowShowing(
-  params: CommonFetchParams,
-): Promise<{
+export async function fetchLotteCinemaNowShowing(params: CommonFetchParams): Promise<{
   theaters: LotteCinemaTheater[];
   movies: LotteCinemaMovie[];
   showtimes: LotteCinemaShowtime[];
diff --git a/tests/api/lottecinema-handlers.test.ts b/tests/api/lottecinema-handlers.test.ts
index 30bece29..7d8aa6ec 100644
--- a/tests/api/lottecinema-handlers.test.ts
+++ b/tests/api/lottecinema-handlers.test.ts
@@ -460,3 +460,26 @@ describe('handleLotteCinemaGetRemainingSeats', () => {
     expect(ctx.json).toHaveBeenCalledWith(expect.objectContaining({ success: false, error: expect.objectContaining({ message: expect.stringContaining('위치를 좌표로 변환하지 못했습니다') }) }), 500);
   });
 });
+
+it.each([
+  ['theaters', handleLotteCinemaFindNearbyTheaters],
+  ['movies', handleLotteCinemaListNowShowing],
+  ['seats', handleLotteCinemaGetRemainingSeats],
+])('비 JSON 원본을 %s API의 내부 오류나 빈 결과로 바꾸지 않는다', async (_name, handler) => {
+  mockFetch.mockResolvedValue(
+    new Response('<!DOCTYPE html>private upstream content', { status: 200 }),
+  );
+  const ctx = createMockContext({ lat: '37.5132941', lng: '127.104215' });
+  await handler(ctx);
+  expect(ctx.json).toHaveBeenCalledWith(
+    expect.objectContaining({
+      success: false,
+      error: {
+        code: 'LOTTECINEMA_INVALID_RESPONSE',
+        message: '롯데시네마 원본 응답을 읽을 수 없습니다. 잠시 후 다시 조회해주세요.',
+      },
+      diagnostics: expect.objectContaining({ upstreamStatus: 200, retryable: true }),
+    }),
+    502,
+  );
+});
diff --git a/tests/services/lottecinema/client.test.ts b/tests/services/lottecinema/client.test.ts
index f26559af..cf73e707 100644
--- a/tests/services/lottecinema/client.test.ts
+++ b/tests/services/lottecinema/client.test.ts
@@ -237,7 +237,9 @@ describe('fetchLotteCinemaNowShowing', () => {
         ),
       )
       .mockResolvedValueOnce(
-        new Response(JSON.stringify({ IsOK: true, ResultMessage: 'SUCCESS', PlaySeqs: { Items: [] } })),
+        new Response(
+          JSON.stringify({ IsOK: true, ResultMessage: 'SUCCESS', PlaySeqs: { Items: [] } }),
+        ),
       );
 
     const result = await fetchLotteCinemaNowShowing({ playDate: '20260310', theaterId: '1016' });
@@ -344,7 +346,9 @@ describe('fetchLotteCinemaNowShowing', () => {
         ),
       )
       .mockResolvedValueOnce(
-        new Response(JSON.stringify({ IsOK: true, ResultMessage: 'SUCCESS', PlaySeqs: { Items: [] } })),
+        new Response(
+          JSON.stringify({ IsOK: true, ResultMessage: 'SUCCESS', PlaySeqs: { Items: [] } }),
+        ),
       );
 
     const result = await fetchLotteCinemaNowShowing({ playDate: '2026-03-10', theaterId: '1016' });
@@ -367,3 +371,27 @@ describe('toYyyymmdd', () => {
     expect(toYyyymmdd(new Date('2026-03-10T00:00:00.000Z'))).toBe('20260310');
   });
 });
+
+it.each(['<!DOCTYPE html><html>private upstream content</html>', '{invalid'])(
+  '비 JSON 원본 응답을 안전한 외부 오류로 분류한다: %s',
+  async (body) => {
+    mockFetch.mockResolvedValue(new Response(body, { status: 200 }));
+    await expect(fetchLotteCinemaTicketingPage()).rejects.toMatchObject({
+      code: 'LOTTECINEMA_INVALID_RESPONSE',
+      status: 502,
+      upstreamStatus: 200,
+      retryable: true,
+      message: '롯데시네마 원본 응답을 읽을 수 없습니다. 잠시 후 다시 조회해주세요.',
+    });
+  },
+);
+
+it('JSON 본문 읽기 중 취소는 원본 형식 오류 대신 기존 시간 초과로 유지한다', async () => {
+  mockFetch.mockResolvedValue({
+    ok: true,
+    json: async () => {
+      throw new DOMException('aborted', 'AbortError');
+    },
+  });
+  await expect(fetchLotteCinemaTicketingPage()).rejects.toThrow('롯데시네마 API 호출 시간 초과');
+});