diff --git a/packages/backend/domain/src/main/java/tw/waterballsa/gaas/citadels/domain/BuildCard.java b/packages/backend/domain/src/main/java/tw/waterballsa/gaas/citadels/domain/BuildCard.java
new file mode 100644
index 00000000..7e14a71e
--- /dev/null
+++ b/packages/backend/domain/src/main/java/tw/waterballsa/gaas/citadels/domain/BuildCard.java
@@ -0,0 +1,27 @@
+package tw.waterballsa.gaas.citadels.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class BuildCard {
+    private String name;
+    private int coins;
+    private Color color;
+
+    public enum Color {
+        PURPLE("特別地區"),
+        YELLOW("貴族地區"),
+        RED("軍事地區"),
+        BLUE("商業地區"),
+        GREEN("宗教地區");
+        private final String area;
+
+        Color(String area) {
+            this.area = area;
+        }
+    }
+
+}
+
diff --git a/packages/backend/domain/src/main/java/tw/waterballsa/gaas/citadels/domain/CharacterCard.java b/packages/backend/domain/src/main/java/tw/waterballsa/gaas/citadels/domain/CharacterCard.java
new file mode 100644
index 00000000..0fa9d974
--- /dev/null
+++ b/packages/backend/domain/src/main/java/tw/waterballsa/gaas/citadels/domain/CharacterCard.java
@@ -0,0 +1,11 @@
+package tw.waterballsa.gaas.citadels.domain;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class CharacterCard {
+    private int sequence;
+    private String name;
+}
diff --git a/packages/backend/domain/src/main/java/tw/waterballsa/gaas/citadels/domain/Game.java b/packages/backend/domain/src/main/java/tw/waterballsa/gaas/citadels/domain/Game.java
new file mode 100644
index 00000000..9123f4c1
--- /dev/null
+++ b/packages/backend/domain/src/main/java/tw/waterballsa/gaas/citadels/domain/Game.java
@@ -0,0 +1,119 @@
+package tw.waterballsa.gaas.citadels.domain;
+
+import lombok.Getter;
+
+import java.time.LocalDateTime;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import static java.util.UUID.randomUUID;
+import static tw.waterballsa.gaas.citadels.domain.Game.Status.PLAYING;
+
+
+@Getter
+public class Game {
+    private final String id;
+    private final String roomId;
+    private final String name;
+    private final Status status;
+    private final LocalDateTime createTime;
+    private final List<Player> players;
+    private final List<CharacterCard> characterCards;
+    private final List<BuildCard> buildCards;
+    public static final Integer DEFAULT_COINS = 2;
+    public static final Integer DEFAULT_CARD_QUANTITY = 2;
+
+    public Game(String roomId, String name, List<Player> players, List<CharacterCard> characterCards, List<BuildCard> buildCards) {
+        this.id = randomUUID().toString();
+        this.roomId = roomId;
+        this.name = name;
+        this.createTime = LocalDateTime.now();
+        this.players = players;
+        this.status = PLAYING;
+        this.characterCards = characterCards;
+        this.buildCards = buildCards;
+    }
+
+    public Game(String id, String roomId, String name, Status status,
+                LocalDateTime createTime, List<Player> players, List<CharacterCard> characterCards,
+                List<BuildCard> buildCards) {
+        this.id = id;
+        this.roomId = roomId;
+        this.name = name;
+        this.status = status;
+        this.createTime = createTime;
+        this.players = players;
+        this.characterCards = characterCards;
+        this.buildCards = buildCards;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getRoomId() {
+        return roomId;
+    }
+
+    public Status getStatus() {
+        return status;
+    }
+
+    public List<Player> getPlayers() {
+        return players;
+    }
+
+
+    public LocalDateTime getCreateTime() {
+        return createTime;
+    }
+
+    public void randomlyAwardCrownToOnePlayer() {
+        Collections.shuffle(players);
+        Player kingPlayer = players.get(0);
+        kingPlayer.acquireCrown();
+    }
+
+    public void start() {
+        randomlyAwardCrownToOnePlayer();
+        distributingCardsAndCoinsToEachPlayer();
+    }
+
+    private void distributingCardsAndCoinsToEachPlayer() {
+        players.forEach(player -> {
+            player.plusCards(getTwoCards());
+            player.plusCoins(2);
+        });
+
+    }
+
+    public List<BuildCard> getTwoCards(){
+        return Arrays.asList(new BuildCard("test",3, BuildCard.Color.BLUE)
+                                    ,new BuildCard("test",2, BuildCard.Color.BLUE));
+    }
+
+    public enum Status {
+        PLAYING,
+        CLOSE
+    }
+
+    @Override
+    public String toString() {
+        return "Game{" +
+                "id='" + id + '\'' +
+                ", roomId='" + roomId + '\'' +
+                ", name='" + name + '\'' +
+                ", status=" + status +
+                ", createTime=" + createTime +
+                ", players=" + players +
+                ", districtCards=" + buildCards +
+                '}';
+    }
+}
+
+
diff --git a/packages/backend/spring/src/main/java/tw/waterballsa/gaas/citadels/spring/controllers/viewmodel/BuildCardView.java b/packages/backend/spring/src/main/java/tw/waterballsa/gaas/citadels/spring/controllers/viewmodel/BuildCardView.java
new file mode 100644
index 00000000..8ee10753
--- /dev/null
+++ b/packages/backend/spring/src/main/java/tw/waterballsa/gaas/citadels/spring/controllers/viewmodel/BuildCardView.java
@@ -0,0 +1,25 @@
+package tw.waterballsa.gaas.citadels.spring.controllers.viewmodel;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import tw.waterballsa.gaas.citadels.domain.BuildCard;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+@Data
+@AllArgsConstructor
+public class BuildCardView {
+    private String name;
+    private int coins;
+    private BuildCard.Color color;
+
+    public static List<BuildCardView> toViewModels(List<BuildCard> buildCards) {
+        return buildCards.stream().map(BuildCardView::toViewModel).collect(Collectors.toList());
+    }
+
+    public static BuildCardView toViewModel(BuildCard buildCard) {
+        return new BuildCardView(buildCard.getName(), buildCard.getCoins(), buildCard.getColor());
+    }
+
+}
diff --git a/packages/backend/spring/src/main/java/tw/waterballsa/gaas/citadels/spring/controllers/viewmodel/CharacterCardView.java b/packages/backend/spring/src/main/java/tw/waterballsa/gaas/citadels/spring/controllers/viewmodel/CharacterCardView.java
new file mode 100644
index 00000000..2d1a5d00
--- /dev/null
+++ b/packages/backend/spring/src/main/java/tw/waterballsa/gaas/citadels/spring/controllers/viewmodel/CharacterCardView.java
@@ -0,0 +1,23 @@
+package tw.waterballsa.gaas.citadels.spring.controllers.viewmodel;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import tw.waterballsa.gaas.citadels.domain.CharacterCard;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+@Data
+@AllArgsConstructor
+public class CharacterCardView {
+    private int sequence;
+    private String name;
+
+    public static CharacterCardView toViewModel(CharacterCard characterCard) {
+        return (characterCard != null) ? new CharacterCardView(characterCard.getSequence(), characterCard.getName()) : null;
+    }
+
+    public static List<CharacterCardView> toViewModels(List<CharacterCard> characterCards) {
+        return characterCards.stream().map(CharacterCardView::toViewModel).collect(Collectors.toList());
+    }
+}
diff --git a/packages/backend/spring/src/main/java/tw/waterballsa/gaas/citadels/spring/repositories/data/BuildCardData.java b/packages/backend/spring/src/main/java/tw/waterballsa/gaas/citadels/spring/repositories/data/BuildCardData.java
new file mode 100644
index 00000000..df384644
--- /dev/null
+++ b/packages/backend/spring/src/main/java/tw/waterballsa/gaas/citadels/spring/repositories/data/BuildCardData.java
@@ -0,0 +1,36 @@
+package tw.waterballsa.gaas.citadels.spring.repositories.data;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import org.springframework.data.annotation.Id;
+import org.springframework.data.mongodb.core.mapping.Document;
+import tw.waterballsa.gaas.citadels.domain.BuildCard;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+@Data
+@Document
+@AllArgsConstructor
+public class BuildCardData {
+    @Id
+    private String name;
+    private int coins;
+    private BuildCard.Color color;
+
+    public static BuildCardData toData(BuildCard buildCard) {
+        return new BuildCardData(buildCard.getName(), buildCard.getCoins(), buildCard.getColor());
+    }
+
+    public static List<BuildCardData> toData(List<BuildCard> buildCards) {
+        return buildCards.stream().map(BuildCardData::toData).collect(Collectors.toList());
+    }
+
+    public static BuildCard toDomain(BuildCardData buildCardData) {
+        return new BuildCard(buildCardData.getName(), buildCardData.getCoins(), buildCardData.getColor());
+    }
+
+    public static List<BuildCard> toDomains(List<BuildCardData> buildCardDataList) {
+        return buildCardDataList.stream().map(BuildCardData::toDomain).collect(Collectors.toList());
+    }
+}
diff --git a/packages/backend/spring/src/main/java/tw/waterballsa/gaas/citadels/spring/repositories/data/CharacterCardData.java b/packages/backend/spring/src/main/java/tw/waterballsa/gaas/citadels/spring/repositories/data/CharacterCardData.java
new file mode 100644
index 00000000..827bcc24
--- /dev/null
+++ b/packages/backend/spring/src/main/java/tw/waterballsa/gaas/citadels/spring/repositories/data/CharacterCardData.java
@@ -0,0 +1,43 @@
+package tw.waterballsa.gaas.citadels.spring.repositories.data;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import org.springframework.data.annotation.Id;
+import org.springframework.data.mongodb.core.mapping.Document;
+import tw.waterballsa.gaas.citadels.domain.CharacterCard;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+@Data
+@Document
+@AllArgsConstructor
+public class CharacterCardData {
+    @Id
+    private int sequence;
+    private String name;
+
+    public static CharacterCardData toData(CharacterCard characterCard) {
+        return (characterCard != null) ? new CharacterCardData(characterCard.getSequence(), characterCard.getName()) : null;
+    }
+
+    public static List<CharacterCardData> toData(List<CharacterCard> characterCards) {
+        return characterCards.stream().map(CharacterCardData::toData).collect(Collectors.toList());
+    }
+
+    public static CharacterCard toDomain(CharacterCardData characterCardData) {
+        return characterCardData != null ? new CharacterCard(characterCardData.getSequence(), characterCardData.getName()) : null;
+    }
+
+    public static Map<Integer, CharacterCard> toDomains(List<CharacterCardData> characterCardDataList) {
+        Map<Integer, CharacterCard> cards = new LinkedHashMap<>();
+        characterCardDataList.forEach(characterCardData -> cards.put(characterCardData.getSequence(), toDomain(characterCardData)));
+        return cards;
+    }
+
+    public static List<CharacterCard> toDomainList(List<CharacterCardData> characterCardDataList) {
+        return characterCardDataList.stream().map(CharacterCardData::toDomain).collect(Collectors.toList());
+    }
+}