diff --git a/frontend/src/pages/MyReservationPage.tsx b/frontend/src/pages/MyReservationPage.tsx
index d25d07f8..ba07456b 100644
--- a/frontend/src/pages/MyReservationPage.tsx
+++ b/frontend/src/pages/MyReservationPage.tsx
@@ -168,7 +168,7 @@ const ReservationDetailView: React.FC<{
             )}
             <p><strong>카드사 / 구분:</strong> {detail.issuerCode}({detail.ownerType}) / {detail.cardType}</p>
             <p><strong>카드 번호:</strong> {detail.cardNumber}</p>
-            <p><strong>할부 방식:</strong> {detail.installmentPlanMonths === 0 ? '일시불' : `${detail.installmentPlanMonths}개월`}</p>
+            <p><strong>할부:</strong> {detail.installmentPlanMonths === 0 ? '일시불' : `${detail.installmentPlanMonths}개월`}</p>
             <p><strong>승인 번호:</strong> {detail.approvalNumber}</p>
           </>
         );
@@ -310,8 +310,8 @@ const MyReservationPage: React.FC = () => {
     try {
       setIsCancelling(true);
       setDetailError(null);
+      await cancelPayment({ reservationId: selectedReservation.id, cancelReason: reason });
       await cancelReservation(selectedReservation.id, reason);
-      cancelPayment({ reservationId: selectedReservation.id, cancelReason: reason });
       alert('예약을 취소했어요. 결제 취소까지는 3-5일 정도 소요될 수 있어요.');
       handleCloseModal();
       await loadReservations(); // Refresh the list
diff --git a/src/main/kotlin/roomescape/reservation/business/ReservationService.kt b/src/main/kotlin/roomescape/reservation/business/ReservationService.kt
index 7e1ce2a5..eb642bfb 100644
--- a/src/main/kotlin/roomescape/reservation/business/ReservationService.kt
+++ b/src/main/kotlin/roomescape/reservation/business/ReservationService.kt
@@ -175,7 +175,7 @@ class ReservationService(
             canceledBy = user.id,
             cancelReason = cancelReason,
             canceledAt = LocalDateTime.now(),
-            status = CanceledReservationStatus.PROCESSING
+            status = CanceledReservationStatus.COMPLETED
         ).also {
             canceledReservationRepository.save(it)
         }
diff --git a/src/main/kotlin/roomescape/reservation/docs/ReservationAPI.kt b/src/main/kotlin/roomescape/reservation/docs/ReservationAPI.kt
index 7f59eb26..77379716 100644
--- a/src/main/kotlin/roomescape/reservation/docs/ReservationAPI.kt
+++ b/src/main/kotlin/roomescape/reservation/docs/ReservationAPI.kt
@@ -19,7 +19,7 @@ import roomescape.reservation.web.*
 interface ReservationAPI {
 
     @Public
-    @Operation(summary = "결제 대기 예약 저장", tags = ["로그인이 필요한 API"])
+    @Operation(summary = "가장 많이 예약된 테마 조회")
     @ApiResponses(ApiResponse(responseCode = "200", description = "성공", useReturnTypeSchema = true))
     fun findMostReservedThemeIds(
         @RequestParam count: Int