diff --git a/src/main/java/roomescape/reservation/infrastructure/persistence/ReservationRepository.kt b/src/main/java/roomescape/reservation/infrastructure/persistence/ReservationRepository.kt
index 5b36ee61..9b676727 100644
--- a/src/main/java/roomescape/reservation/infrastructure/persistence/ReservationRepository.kt
+++ b/src/main/java/roomescape/reservation/infrastructure/persistence/ReservationRepository.kt
@@ -1,32 +1,31 @@
-package roomescape.reservation.infrastructure.persistence;
+package roomescape.reservation.infrastructure.persistence
 
-import java.util.List;
+import org.springframework.data.jpa.repository.JpaRepository
+import org.springframework.data.jpa.repository.JpaSpecificationExecutor
+import org.springframework.data.jpa.repository.Modifying
+import org.springframework.data.jpa.repository.Query
+import org.springframework.data.repository.query.Param
+import roomescape.reservation.web.MyReservationResponse
 
-import org.springframework.data.jpa.repository.JpaRepository;
-import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
-import org.springframework.data.jpa.repository.Modifying;
-import org.springframework.data.jpa.repository.Query;
-import org.springframework.data.repository.query.Param;
+interface ReservationRepository
+    : JpaRepository<ReservationEntity, Long>, JpaSpecificationExecutor<ReservationEntity>
+{
+    fun findByReservationTime(reservationTime: ReservationTimeEntity): List<ReservationEntity>
 
-import roomescape.reservation.web.MyReservationResponse;
+    fun findByThemeId(themeId: Long): List<ReservationEntity>
 
-public interface ReservationRepository
-	extends JpaRepository<ReservationEntity, Long>, JpaSpecificationExecutor<ReservationEntity> {
-
-	List<ReservationEntity> findByReservationTime(ReservationTimeEntity reservationTime);
-
-	List<ReservationEntity> findByThemeId(Long themeId);
-
-	@Modifying
-	@Query("""
+    @Modifying
+    @Query("""
 		UPDATE ReservationEntity r
 		SET r.reservationStatus = :status
 		WHERE r.id = :id
 		""")
-	int updateStatusByReservationId(@Param(value = "id") Long reservationId,
-		@Param(value = "status") ReservationStatus statusForChange);
+    fun updateStatusByReservationId(
+            @Param(value = "id") reservationId: Long,
+            @Param(value = "status") statusForChange: ReservationStatus
+    ): Int
 
-	@Query("""
+    @Query("""
 		SELECT EXISTS (
 		   SELECT 1 FROM ReservationEntity r
 		   WHERE r.theme.id = r2.theme.id
@@ -37,9 +36,9 @@ public interface ReservationRepository
 		FROM ReservationEntity r2
 		WHERE r2.id = :id
 		""")
-	boolean isExistConfirmedReservation(@Param("id") Long reservationId);
+    fun isExistConfirmedReservation(@Param("id") reservationId: Long): Boolean
 
-	@Query("""
+    @Query("""
 		SELECT new roomescape.reservation.web.MyReservationResponse(
 		    r.id,
 		    t.name,
@@ -56,5 +55,5 @@ public interface ReservationRepository
 		ON p.reservation = r
 		WHERE r.member.id = :memberId
 		""")
-	List<MyReservationResponse> findMyReservations(Long memberId);
+    fun findMyReservations(memberId: Long): List<MyReservationResponse>
 }