diff --git a/core-module/src/main/java/com/foodgo/coremodule/community/domain/Challenge.java b/core-module/src/main/java/com/foodgo/coremodule/community/domain/Challenge.java
new file mode 100644
index 0000000..95a4140
--- /dev/null
+++ b/core-module/src/main/java/com/foodgo/coremodule/community/domain/Challenge.java
@@ -0,0 +1,25 @@
+package com.foodgo.coremodule.community.domain;
+
+import com.foodgo.commonmodule.common.BaseEntity;
+import jakarta.persistence.*;
+import lombok.*;
+
+@Builder
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor
+@Getter
+@Entity
+@Table(name = "challenges")
+public class Challenge extends BaseEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "challenge_id")
+    private Long id;
+
+    @Column(name = "challenge_name", nullable = false)
+    private String name;
+
+    @Column(name = "challenge_description")
+    private String description;
+}
diff --git a/core-module/src/main/java/com/foodgo/coremodule/community/domain/ChallengeDetail.java b/core-module/src/main/java/com/foodgo/coremodule/community/domain/ChallengeDetail.java
new file mode 100644
index 0000000..8bcbddc
--- /dev/null
+++ b/core-module/src/main/java/com/foodgo/coremodule/community/domain/ChallengeDetail.java
@@ -0,0 +1,36 @@
+package com.foodgo.coremodule.community.domain;
+
+import com.foodgo.commonmodule.common.BaseEntity;
+import com.foodgo.coremodule.user.domain.User;
+import jakarta.persistence.*;
+import lombok.*;
+
+@Builder
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor
+@Getter
+@Entity
+@Table(name = "challenge_deail")
+public class ChallengeDetail extends BaseEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "challenge_detail_id")
+    private Long id;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "challenge_id", foreignKey = @ForeignKey(ConstraintMode.NO_CONSTRAINT))
+    private Challenge challenge;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "user_id", foreignKey = @ForeignKey(ConstraintMode.NO_CONSTRAINT))
+    private User user;
+
+    @Column(name = "target_value", nullable = false)
+    private Integer targetValue;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "friendship_id", foreignKey = @ForeignKey(ConstraintMode.NO_CONSTRAINT))
+    private Friendship friendship;
+}
+
diff --git a/core-module/src/main/java/com/foodgo/coremodule/community/domain/Friendship.java b/core-module/src/main/java/com/foodgo/coremodule/community/domain/Friendship.java
new file mode 100644
index 0000000..9ca7227
--- /dev/null
+++ b/core-module/src/main/java/com/foodgo/coremodule/community/domain/Friendship.java
@@ -0,0 +1,44 @@
+package com.foodgo.coremodule.community.domain;
+
+import com.foodgo.commonmodule.common.BaseEntity;
+import com.foodgo.coremodule.user.domain.User;
+import jakarta.persistence.*;
+import lombok.*;
+
+@Builder
+@Getter
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor
+@Entity
+@Table(name = "friendship")
+public class Friendship extends BaseEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "friendship_id")
+    private Long id;
+
+    @ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
+    @JoinColumn(name = "user_id", foreignKey = @ForeignKey(ConstraintMode.NO_CONSTRAINT))
+    private User user;
+
+    @ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
+    @JoinColumn(name = "friend_id", foreignKey = @ForeignKey(ConstraintMode.NO_CONSTRAINT))
+    private User friend;
+
+    @Column(name = "is_mutual", nullable = false)
+    private Boolean isMutual;
+
+    public static Friendship createFriendship(User user, User friend) {
+        return Friendship.builder()
+                .user(user)
+                .friend(friend)
+                .isMutual(false)
+                .build();
+    }
+
+    public void markAsMutual() {
+        this.isMutual = true;
+    }
+}
+
diff --git a/core-module/src/main/java/com/foodgo/coremodule/user/domain/User.java b/core-module/src/main/java/com/foodgo/coremodule/user/domain/User.java
index f541f19..8d40bfb 100644
--- a/core-module/src/main/java/com/foodgo/coremodule/user/domain/User.java
+++ b/core-module/src/main/java/com/foodgo/coremodule/user/domain/User.java
@@ -1,12 +1,10 @@
 package com.foodgo.coremodule.user.domain;
 
-import com.fasterxml.jackson.annotation.JsonProperty;
 import com.foodgo.commonmodule.common.BaseEntity;
 import com.foodgo.coremodule.user.enums.DiseaseType;
 import com.foodgo.coremodule.user.enums.RoleType;
 import com.foodgo.coremodule.user.enums.UsageType;
 import com.foodgo.coremodule.user.enums.UserStatus;
-
 import jakarta.persistence.*;
 import lombok.*;