diff --git a/src/main/java/grep/neogulcoder/domain/buddy/entity/BuddyEnergy.java b/src/main/java/grep/neogulcoder/domain/buddy/entity/BuddyEnergy.java
index 984417f6..f030a94e 100644
--- a/src/main/java/grep/neogulcoder/domain/buddy/entity/BuddyEnergy.java
+++ b/src/main/java/grep/neogulcoder/domain/buddy/entity/BuddyEnergy.java
@@ -43,9 +43,16 @@ public void updateLevel(int newLevel) {
     // 리뷰 타입 기반 에너지 변경 //
     public void updateEnergy(ReviewType reviewType) {
         if (reviewType == ReviewType.GOOD || reviewType == ReviewType.EXCELLENT) {
-            this.level += 1;
+            this.level += BuddyEnergyReason.POSITIVE_REVIEW.getPoint();
         } else if (reviewType == ReviewType.BAD) {
-            this.level -= 1;
+            this.level += BuddyEnergyReason.NEGATIVE_REVIEW.getPoint();
+        }
+    }
+
+    public void updateEnergy(boolean isLeader) {
+        this.level += BuddyEnergyReason.STUDY_DONE.getPoint();
+        if (isLeader) {
+            this.level += BuddyEnergyReason.TEAM_LEADER_BONUS.getPoint();
         }
     }
 
diff --git a/src/main/java/grep/neogulcoder/domain/buddy/repository/BuddyEnergyRepository.java b/src/main/java/grep/neogulcoder/domain/buddy/repository/BuddyEnergyRepository.java
index 6bbbcbc0..76550fd3 100644
--- a/src/main/java/grep/neogulcoder/domain/buddy/repository/BuddyEnergyRepository.java
+++ b/src/main/java/grep/neogulcoder/domain/buddy/repository/BuddyEnergyRepository.java
@@ -1,6 +1,9 @@
 package grep.neogulcoder.domain.buddy.repository;
 
 import grep.neogulcoder.domain.buddy.entity.BuddyEnergy;
+
+import java.util.Collection;
+import java.util.List;
 import java.util.Optional;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Repository;
@@ -9,4 +12,5 @@
 public interface BuddyEnergyRepository extends JpaRepository<BuddyEnergy, Long> {
     Optional<BuddyEnergy> findByUserId(Long userId);
 
+    List<BuddyEnergy> findAllByUserIdIn(Collection<Long> userIds);
 }
diff --git a/src/main/java/grep/neogulcoder/domain/buddy/service/BuddyEnergyService.java b/src/main/java/grep/neogulcoder/domain/buddy/service/BuddyEnergyService.java
index eda79168..4c56c5be 100644
--- a/src/main/java/grep/neogulcoder/domain/buddy/service/BuddyEnergyService.java
+++ b/src/main/java/grep/neogulcoder/domain/buddy/service/BuddyEnergyService.java
@@ -46,23 +46,14 @@ public BuddyEnergyResponse updateEnergyByReview(Long userId, ReviewType reviewTy
 
     // 스터디 종료 시 +1, 리더면 +2
     @Transactional
-    public BuddyEnergyResponse updateEnergyByStudy(Long userId, boolean isLeader) {
-        BuddyEnergy energy = buddyEnergyRepository.findByUserId(userId)
-            .orElseThrow(() -> new BuddyEnergyNotFoundException(BUDDY_ENERGY_NOT_FOUND));
-
-        int points = BuddyEnergyReason.STUDY_DONE.getPoint();
-        BuddyEnergyReason reason = BuddyEnergyReason.STUDY_DONE;
+    public void updateEnergyByStudy(BuddyEnergy energy, boolean isLeader) {
+        energy.updateEnergy(isLeader);
 
+        buddyEnergyLogRepository.save(BuddyLog.of(energy, BuddyEnergyReason.STUDY_DONE));
         if (isLeader) {
-            points += BuddyEnergyReason.TEAM_LEADER_BONUS.getPoint();
-            reason = BuddyEnergyReason.TEAM_LEADER_BONUS;
+            buddyEnergyLogRepository.save(BuddyLog.of(energy, BuddyEnergyReason.TEAM_LEADER_BONUS));
         }
-
-        energy.updateLevel(energy.getLevel() + points);
-        buddyEnergyLogRepository.save(BuddyLog.of(energy, reason));
-        buddyEnergyRepository.save(energy);
-
-        return BuddyEnergyResponse.from(energy);
+        BuddyEnergyResponse.from(energy);
     }
 
     // 회원가입 시 기본 에너지 생성
diff --git a/src/main/java/grep/neogulcoder/domain/study/repository/StudyMemberQueryRepository.java b/src/main/java/grep/neogulcoder/domain/study/repository/StudyMemberQueryRepository.java
index 1f6963d3..6811d2aa 100644
--- a/src/main/java/grep/neogulcoder/domain/study/repository/StudyMemberQueryRepository.java
+++ b/src/main/java/grep/neogulcoder/domain/study/repository/StudyMemberQueryRepository.java
@@ -129,9 +129,11 @@ public List<StudyMember> findActivatedMembersByStudyIds(List<Long> studyIds) {
         return queryFactory
             .selectFrom(studyMember)
             .join(studyMember.study, study).fetchJoin()
+            .join(user).on(user.id.eq(studyMember.userId)).fetchJoin()
             .where(
                 studyMember.study.id.in(studyIds),
-                studyMember.activated.isTrue()
+                studyMember.activated.isTrue(),
+                user.activated.isTrue()
             )
             .fetch();
     }
diff --git a/src/main/java/grep/neogulcoder/domain/study/repository/StudyMemberRepository.java b/src/main/java/grep/neogulcoder/domain/study/repository/StudyMemberRepository.java
index 7d47d351..ebedb1a9 100644
--- a/src/main/java/grep/neogulcoder/domain/study/repository/StudyMemberRepository.java
+++ b/src/main/java/grep/neogulcoder/domain/study/repository/StudyMemberRepository.java
@@ -29,8 +29,6 @@ public interface StudyMemberRepository extends JpaRepository<StudyMember, Long>
     @Query("update StudyMember m set m.activated = false where m.study.id = :studyId")
     void deactivateByStudyId(@Param("studyId") Long studyId);
 
-    Optional<StudyMember> findByStudyIdAndUserId(Long studyId, Long userId);
-
     Optional<StudyMember> findByStudyIdAndUserIdAndActivatedTrue(Long studyId, Long userId);
 
     @Query("select m from StudyMember m where m.study.id = :studyId and m.role = 'MEMBER' and m.activated = true")
diff --git a/src/main/java/grep/neogulcoder/domain/study/service/StudyManagementService.java b/src/main/java/grep/neogulcoder/domain/study/service/StudyManagementService.java
index 5b6e00ce..0e392bac 100644
--- a/src/main/java/grep/neogulcoder/domain/study/service/StudyManagementService.java
+++ b/src/main/java/grep/neogulcoder/domain/study/service/StudyManagementService.java
@@ -175,7 +175,7 @@ private Study getStudyById(Long studyId) {
     }
 
     private StudyMember getStudyMemberById(Long studyId, Long userId) {
-        return studyMemberRepository.findByStudyIdAndUserId(studyId, userId)
+        return studyMemberRepository.findByStudyIdAndUserIdAndActivatedTrue(studyId, userId)
             .orElseThrow(() -> new NotFoundException(STUDY_MEMBER_NOT_FOUND));
     }
 
diff --git a/src/main/java/grep/neogulcoder/domain/study/service/StudySchedulerService.java b/src/main/java/grep/neogulcoder/domain/study/service/StudySchedulerService.java
index 57f3c876..1523e98d 100644
--- a/src/main/java/grep/neogulcoder/domain/study/service/StudySchedulerService.java
+++ b/src/main/java/grep/neogulcoder/domain/study/service/StudySchedulerService.java
@@ -1,11 +1,12 @@
 package grep.neogulcoder.domain.study.service;
 
+import grep.neogulcoder.domain.buddy.entity.BuddyEnergy;
+import grep.neogulcoder.domain.buddy.repository.BuddyEnergyRepository;
 import grep.neogulcoder.domain.buddy.service.BuddyEnergyService;
 import grep.neogulcoder.domain.study.Study;
 import grep.neogulcoder.domain.study.StudyMember;
 import grep.neogulcoder.domain.study.event.StudyExtensionReminderEvent;
 import grep.neogulcoder.domain.study.repository.StudyMemberQueryRepository;
-import grep.neogulcoder.domain.study.repository.StudyMemberRepository;
 import grep.neogulcoder.domain.study.repository.StudyRepository;
 import lombok.RequiredArgsConstructor;
 import org.springframework.context.ApplicationEventPublisher;
@@ -16,6 +17,7 @@
 import java.time.LocalDateTime;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import java.util.stream.Collectors;
 
 @Transactional(readOnly = true)
@@ -25,9 +27,9 @@ public class StudySchedulerService {
 
     private final StudyRepository studyRepository;
     private final BuddyEnergyService buddyEnergyService;
-    private final StudyMemberRepository studyMemberRepository;
     private final ApplicationEventPublisher eventPublisher;
     private final StudyMemberQueryRepository studyMemberQueryRepository;
+    private final BuddyEnergyRepository buddyEnergyRepository;
 
     @Transactional
     public void findStudiesEndingIn7Days() {
@@ -48,14 +50,15 @@ public void finalizeStudies() {
         List<Study> studiesToBeFinished = studyRepository.findStudiesToBeFinished(now);
 
         Map<Long, List<StudyMember>> memberMap = getActivatedMemberMap(studiesToBeFinished);
+        Map<Long, BuddyEnergy> energyMap = getBuddyEnergyMap(memberMap);
 
         for (Study study : studiesToBeFinished) {
             study.finish();
 
-            // 스터디 멤버들 조회 후 버디에너지 업데이트
             List<StudyMember> members = memberMap.getOrDefault(study.getId(), List.of());
             for (StudyMember member : members) {
-                buddyEnergyService.updateEnergyByStudy(member.getUserId(), member.isLeader());
+                BuddyEnergy energy = energyMap.get(member.getUserId());
+                buddyEnergyService.updateEnergyByStudy(energy, member.isLeader());
             }
         }
     }
@@ -70,4 +73,19 @@ private Map<Long, List<StudyMember>> getActivatedMemberMap(List<Study> studies)
         return allActivatedMembers.stream()
             .collect(Collectors.groupingBy(studyMember -> studyMember.getStudy().getId()));
     }
+
+    private Map<Long, BuddyEnergy> getBuddyEnergyMap(Map<Long, List<StudyMember>> memberMap) {
+        Set<Long> userIds = memberMap.values().stream()
+            .flatMap(List::stream)
+            .map(StudyMember::getUserId)
+            .collect(Collectors.toSet());
+
+        Map<Long, BuddyEnergy> energyMap = buddyEnergyRepository.findAllByUserIdIn(userIds).stream()
+            .collect(Collectors.toMap(
+                BuddyEnergy::getUserId,
+                energy -> energy
+            ));
+
+        return energyMap;
+    }
 }
diff --git a/src/main/java/grep/neogulcoder/domain/study/service/StudyService.java b/src/main/java/grep/neogulcoder/domain/study/service/StudyService.java
index b97b427c..e4e33ae6 100644
--- a/src/main/java/grep/neogulcoder/domain/study/service/StudyService.java
+++ b/src/main/java/grep/neogulcoder/domain/study/service/StudyService.java
@@ -38,11 +38,10 @@
 import java.time.LocalDateTime;
 import java.time.temporal.ChronoUnit;
 import java.util.List;
-import java.util.Optional;
 
-import static grep.neogulcoder.domain.study.enums.StudyMemberRole.*;
+import static grep.neogulcoder.domain.study.enums.StudyMemberRole.LEADER;
 import static grep.neogulcoder.domain.study.exception.code.StudyErrorCode.*;
-import static grep.neogulcoder.domain.users.exception.code.UserErrorCode.*;
+import static grep.neogulcoder.domain.users.exception.code.UserErrorCode.USER_NOT_FOUND;
 
 @Transactional(readOnly = true)
 @RequiredArgsConstructor
@@ -179,7 +178,7 @@ private Study getStudyById(Long studyId) {
     }
 
     private StudyMember getStudyMemberById(Long studyId, Long userId) {
-        return Optional.ofNullable(studyMemberQueryRepository.findByStudyIdAndUserId(studyId, userId))
+        return studyMemberRepository.findByStudyIdAndUserIdAndActivatedTrue(studyId, userId)
             .orElseThrow(() -> new NotFoundException(STUDY_MEMBER_NOT_FOUND));
     }