diff --git a/Entity/System/Activity.cs b/Entity/Explore/Activity.cs
similarity index 100%
rename from Entity/System/Activity.cs
rename to Entity/Explore/Activity.cs
diff --git a/Entity/System/Quest.cs b/Entity/Explore/Quest.cs
similarity index 98%
rename from Entity/System/Quest.cs
rename to Entity/Explore/Quest.cs
index 9ef1570..dba3f4f 100644
--- a/Entity/System/Quest.cs
+++ b/Entity/Explore/Quest.cs
@@ -9,6 +9,7 @@ namespace Milimoe.FunGame.Core.Entity
         public QuestState Status { get; set; } = QuestState.NotStarted;
         public long CharacterId { get; set; } = 0;
         public long RegionId { get; set; } = 0;
+        public string NeedyExploreItemName { get; set; } = "";
         public double CreditsAward { get; set; } = 0;
         public double MaterialsAward { get; set; } = 0;
         public HashSet<Item> Awards { get; set; } = [];
diff --git a/Entity/System/Region.cs b/Entity/Explore/Region.cs
similarity index 99%
rename from Entity/System/Region.cs
rename to Entity/Explore/Region.cs
index b70435d..f1d2fbc 100644
--- a/Entity/System/Region.cs
+++ b/Entity/Explore/Region.cs
@@ -1,6 +1,7 @@
 using System.Text;
 using Milimoe.FunGame.Core.Interface.Entity;
 using Milimoe.FunGame.Core.Library.Constant;
+using Milimoe.FunGame.Core.Model;
 
 namespace Milimoe.FunGame.Core.Entity
 {
diff --git a/Entity/System/Goods.cs b/Entity/Trade/Goods.cs
similarity index 100%
rename from Entity/System/Goods.cs
rename to Entity/Trade/Goods.cs
diff --git a/Entity/System/MarketItem.cs b/Entity/Trade/MarketItem.cs
similarity index 100%
rename from Entity/System/MarketItem.cs
rename to Entity/Trade/MarketItem.cs
diff --git a/Entity/System/Offer.cs b/Entity/Trade/Offer.cs
similarity index 100%
rename from Entity/System/Offer.cs
rename to Entity/Trade/Offer.cs
diff --git a/Entity/System/Store.cs b/Entity/Trade/Store.cs
similarity index 100%
rename from Entity/System/Store.cs
rename to Entity/Trade/Store.cs
diff --git a/Entity/System/Inventory.cs b/Entity/User/Inventory.cs
similarity index 100%
rename from Entity/System/Inventory.cs
rename to Entity/User/Inventory.cs
diff --git a/Library/Common/JsonConverter/QuestConverter.cs b/Library/Common/JsonConverter/QuestConverter.cs
index 02f7645..daae35a 100644
--- a/Library/Common/JsonConverter/QuestConverter.cs
+++ b/Library/Common/JsonConverter/QuestConverter.cs
@@ -38,6 +38,9 @@ namespace Milimoe.FunGame.Core.Library.Common.JsonConverter
                 case nameof(Quest.RegionId):
                     result.RegionId = reader.GetInt64();
                     break;
+                case nameof(Quest.NeedyExploreItemName):
+                    result.NeedyExploreItemName = reader.GetString() ?? "";
+                    break;
                 case nameof(Quest.CreditsAward):
                     result.CreditsAward = reader.GetDouble();
                     break;
@@ -102,6 +105,7 @@ namespace Milimoe.FunGame.Core.Library.Common.JsonConverter
             writer.WriteNumber(nameof(Quest.Status), (int)value.Status);
             writer.WriteNumber(nameof(Quest.CharacterId), value.CharacterId);
             writer.WriteNumber(nameof(Quest.RegionId), value.RegionId);
+            writer.WriteString(nameof(Quest.NeedyExploreItemName), value.NeedyExploreItemName);
             writer.WriteNumber(nameof(Quest.CreditsAward), value.CreditsAward);
             writer.WriteNumber(nameof(Quest.MaterialsAward), value.MaterialsAward);
             writer.WritePropertyName(nameof(Quest.Awards));