diff --git a/src/main/java/com/genius/gitget/challenge/instance/service/InstanceDetailService.java b/src/main/java/com/genius/gitget/challenge/instance/service/InstanceDetailService.java
index d3c64735..5d331418 100644
--- a/src/main/java/com/genius/gitget/challenge/instance/service/InstanceDetailService.java
+++ b/src/main/java/com/genius/gitget/challenge/instance/service/InstanceDetailService.java
@@ -46,7 +46,7 @@ public InstanceResponse getInstanceDetailInformation(User user, Long instanceId)
         FileResponse fileResponse = filesService.convertToFileResponse(instance.getFiles());
         LikesInfo likesInfo = getLikesInfo(user.getId(), instance);
 
-        if (participantProvider.hasParticipant(user.getId(), instanceId)) {
+        if (participantProvider.hasJoinedParticipant(user.getId(), instanceId)) {
             return InstanceResponse.createByEntity(instance, likesInfo, JoinStatus.YES, fileResponse);
         }
 
@@ -90,7 +90,7 @@ private void validateJoinDate(Instance instance, LocalDate todayDate) {
     }
 
     private void validateInstanceCondition(User user, Instance instance) {
-        boolean isParticipated = participantProvider.hasParticipant(user.getId(), instance.getId());
+        boolean isParticipated = participantProvider.hasJoinedParticipant(user.getId(), instance.getId());
         if ((instance.getProgress() == Progress.PREACTIVITY) && !isParticipated) {
             return;
         }
diff --git a/src/main/java/com/genius/gitget/challenge/participant/service/ParticipantProvider.java b/src/main/java/com/genius/gitget/challenge/participant/service/ParticipantProvider.java
index ef418e7a..97d963bf 100644
--- a/src/main/java/com/genius/gitget/challenge/participant/service/ParticipantProvider.java
+++ b/src/main/java/com/genius/gitget/challenge/participant/service/ParticipantProvider.java
@@ -8,7 +8,6 @@
 import com.genius.gitget.challenge.participant.domain.Participant;
 import com.genius.gitget.challenge.participant.repository.ParticipantRepository;
 import com.genius.gitget.global.util.exception.BusinessException;
-import java.time.LocalDate;
 import java.util.List;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
@@ -65,12 +64,9 @@ public List<Participant> findJoinedByProgress(Long userId, Progress progress) {
         return participantRepository.findAllJoinedByProgress(userId, progress);
     }
 
-    public boolean hasParticipant(Long userId, Long instanceId) {
-        return participantRepository.findByJoinInfo(userId, instanceId).isPresent();
-    }
-
-    public LocalDate getInstanceStartDate(Long participantId) {
-        return getInstanceById(participantId).getStartedDate().toLocalDate();
+    public boolean hasJoinedParticipant(Long userId, Long instanceId) {
+        return participantRepository.findByJoinInfo(userId, instanceId)
+                .map(participant -> participant.getJoinStatus() != JoinStatus.NO)
+                .orElse(false);
     }
-
 }