diff --git a/server/src/main/java/com/green/greenearthforus/calendar/entity/Calendar.java b/server/src/main/java/com/green/greenearthforus/calendar/entity/Calendar.java
index f5603582..069f940e 100644
--- a/server/src/main/java/com/green/greenearthforus/calendar/entity/Calendar.java
+++ b/server/src/main/java/com/green/greenearthforus/calendar/entity/Calendar.java
@@ -29,7 +29,7 @@ public class Calendar {
     @ElementCollection
     private List<LocalDate> stampedDates;
 
-    @OneToOne
+    @OneToOne(cascade = CascadeType.ALL, orphanRemoval = true)
     @JoinColumn(name = "user_id")
     private User user;
 
diff --git a/server/src/main/java/com/green/greenearthforus/comment/entity/Comment.java b/server/src/main/java/com/green/greenearthforus/comment/entity/Comment.java
index 0c1bb43a..50d28ac4 100644
--- a/server/src/main/java/com/green/greenearthforus/comment/entity/Comment.java
+++ b/server/src/main/java/com/green/greenearthforus/comment/entity/Comment.java
@@ -27,11 +27,11 @@ public class Comment {
     @Column(name = "created_at")
     private LocalDateTime createdAt;
 
-    @ManyToOne(fetch = FetchType.LAZY)
+    @ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
     @JoinColumn(name = "user_id")
     private User user;
 
-    @ManyToOne
+    @ManyToOne(cascade = CascadeType.ALL)
     @JoinColumn(name = "post_id")
     private Post post;
 }
diff --git a/server/src/main/java/com/green/greenearthforus/vote/entity/Vote.java b/server/src/main/java/com/green/greenearthforus/vote/entity/Vote.java
index 87bdcb60..a61be0e8 100644
--- a/server/src/main/java/com/green/greenearthforus/vote/entity/Vote.java
+++ b/server/src/main/java/com/green/greenearthforus/vote/entity/Vote.java
@@ -22,7 +22,7 @@ public class Vote {
     @Column
     private String voteType;
 
-    @OneToOne
+    @OneToOne(cascade = CascadeType.ALL, orphanRemoval = true)
     @JoinColumn(name = "post_id")
     private Post post;
 
diff --git a/server/src/main/java/com/green/greenearthforus/vote/entity/VoteUser.java b/server/src/main/java/com/green/greenearthforus/vote/entity/VoteUser.java
index 01f2a8e3..cef76104 100644
--- a/server/src/main/java/com/green/greenearthforus/vote/entity/VoteUser.java
+++ b/server/src/main/java/com/green/greenearthforus/vote/entity/VoteUser.java
@@ -15,11 +15,11 @@ public class VoteUser {
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private long voteUserId;
 
-    @ManyToOne
+    @ManyToOne(cascade = CascadeType.ALL)
     @JoinColumn(name = "user_id")
     private User user;
 
-    @ManyToOne
+    @ManyToOne(cascade = CascadeType.ALL)
     @JoinColumn(name = "vote_id")
     private Vote vote;