diff --git a/src/main/java/com/moabam/api/application/room/CertificationService.java b/src/main/java/com/moabam/api/application/room/CertificationService.java
index 6f024e6f..c34c7be5 100644
--- a/src/main/java/com/moabam/api/application/room/CertificationService.java
+++ b/src/main/java/com/moabam/api/application/room/CertificationService.java
@@ -113,14 +113,6 @@ public Certification findCertification(Long certificationId) {
 			.orElseThrow(() -> new NotFoundException(CERTIFICATION_NOT_FOUND));
 	}
 
-	public List<Certification> findCertifications(List<Routine> routines) {
-		return certificationsSearchRepository.findCertificationsByRoutines(routines);
-	}
-
-	public void deleteCertifications(List<Certification> certifications) {
-		certificationRepository.deleteAll(certifications);
-	}
-
 	private void validateCertifyTime(LocalDateTime now, int certifyTime) {
 		LocalTime targetTime = LocalTime.of(certifyTime, 0);
 		LocalDateTime targetDateTime = LocalDateTime.of(now.toLocalDate(), targetTime);
diff --git a/src/main/java/com/moabam/api/application/room/SearchService.java b/src/main/java/com/moabam/api/application/room/SearchService.java
index aafb5bb9..8938dc76 100644
--- a/src/main/java/com/moabam/api/application/room/SearchService.java
+++ b/src/main/java/com/moabam/api/application/room/SearchService.java
@@ -263,6 +263,7 @@ private List<TodayCertificateRankResponse> getTodayCertificateRankResponses(Long
 		List<Participant> participants = participantSearchRepository.findAllParticipantsByRoomId(roomId);
 		List<Member> members = memberService.getRoomMembers(participants.stream()
 			.map(Participant::getMemberId)
+			.distinct()
 			.toList());
 
 		List<Long> knocks = notificationService.getMyKnockStatusInRoom(memberId, roomId, participants);