diff --git a/moonshot-api/src/main/java/org/moonshot/objective/service/ObjectiveService.java b/moonshot-api/src/main/java/org/moonshot/objective/service/ObjectiveService.java
index 86536eb1..ff9acadf 100644
--- a/moonshot-api/src/main/java/org/moonshot/objective/service/ObjectiveService.java
+++ b/moonshot-api/src/main/java/org/moonshot/objective/service/ObjectiveService.java
@@ -11,9 +11,7 @@
 import static org.moonshot.validator.IndexValidator.isSameIndex;
 
 import java.time.LocalDate;
-import java.util.Comparator;
-import java.util.List;
-import java.util.Map;
+import java.util.*;
 import java.util.stream.Collectors;
 import lombok.RequiredArgsConstructor;
 import org.moonshot.common.model.Period;
@@ -144,7 +142,10 @@ public HistoryResponseDto getObjectiveHistory(final Long userId, final Integer y
     @Transactional(readOnly = true)
     public List<SocialOKRResponseDto> getObjectiveSocial() {
         List<Objective> objectives = objectiveRepository.findSocialObjectives();
+        Set<Long> objectiveIds = new LinkedHashSet<>();
+
         return objectives.stream()
+                .filter(objective -> objectiveIds.add(objective.getId()))
                 .map(SocialOKRResponseDto::of)
                 .toList();
     }
diff --git a/moonshot-common/src/main/java/org/moonshot/constants/RegexConstants.java b/moonshot-common/src/main/java/org/moonshot/constants/RegexConstants.java
index b1c5056a..fad49d34 100644
--- a/moonshot-common/src/main/java/org/moonshot/constants/RegexConstants.java
+++ b/moonshot-common/src/main/java/org/moonshot/constants/RegexConstants.java
@@ -1,5 +1,5 @@
 package org.moonshot.constants;
 
 public class RegexConstants {
-    public static final String nicknameRegex = "^[a-zA-Z0-9가-힣]{1,7}$";
+    public static final String nicknameRegex = "^[a-zA-Z0-9ㄱ-ㅎㅏ-ㅣ가-힣]{1,7}$";
 }
diff --git a/moonshot-domain/src/main/java/org/moonshot/objective/repository/ObjectiveCustomRepositoryImpl.java b/moonshot-domain/src/main/java/org/moonshot/objective/repository/ObjectiveCustomRepositoryImpl.java
index 350884f8..d8a5996b 100644
--- a/moonshot-domain/src/main/java/org/moonshot/objective/repository/ObjectiveCustomRepositoryImpl.java
+++ b/moonshot-domain/src/main/java/org/moonshot/objective/repository/ObjectiveCustomRepositoryImpl.java
@@ -3,11 +3,17 @@
 import static org.moonshot.keyresult.model.QKeyResult.keyResult;
 import static org.moonshot.objective.model.QObjective.objective;
 import static org.moonshot.task.model.QTask.task;
+import static org.moonshot.user.model.QUser.user;
 
 import com.querydsl.core.types.OrderSpecifier;
 import com.querydsl.core.types.dsl.BooleanExpression;
 import com.querydsl.jpa.impl.JPAQueryFactory;
+
+import java.util.LinkedHashSet;
 import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
+
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.hibernate.Hibernate;
@@ -72,12 +78,12 @@ private OrderSpecifier<?> order(Criteria criteria) {
 
     @Override
     public List<Objective> findSocialObjectives() {
-        return queryFactory.selectFrom(objective).distinct()
-                .join(objective.user).fetchJoin()
+        return queryFactory.selectFrom(objective)
+                .join(objective.user, user).fetchJoin()
                 .leftJoin(objective.keyResultList, keyResult).fetchJoin()
                 .leftJoin(keyResult.taskList, task)
                 .where(objective.isPublic.eq(true))
-                .orderBy(objective.heartCount.desc(), objective.id.desc(), keyResult.idx.asc(), task.id.asc())
+                .orderBy(objective.heartCount.desc(), objective.id.desc(), keyResult.idx.asc(), task.idx.asc())
                 .limit(10)
                 .fetch();
     }