diff --git a/scripts/character/CharacterTemplate.cs b/scripts/character/CharacterTemplate.cs
index ffc56af..826e57f 100644
--- a/scripts/character/CharacterTemplate.cs
+++ b/scripts/character/CharacterTemplate.cs
@@ -766,7 +766,7 @@ public partial class CharacterTemplate : CharacterBody2D
         var actualQuantity = number < 0 ? item.Quantity : Math.Min(item.Quantity, number);
         for (var i = 0; i < actualQuantity; i++)
         {
-            ThrowOneItem(item, velocity);
+            ThrowOneItem(index, item, velocity);
         }
     }
 
@@ -774,12 +774,13 @@ public partial class CharacterTemplate : CharacterBody2D
     ///  <para>Throw item</para>
     ///  <para>抛出物品</para>
     ///  </summary>
+    ///  <param name="index"></param>
     ///  <param name="originalItem"></param>
     ///  <param name="velocity">
     /// <para>The speed to be applied to the item</para>
     /// <para>要施加到物品上的速度</para>
     ///  </param>
-    private void ThrowOneItem(IItem originalItem, Vector2 velocity)
+    private void ThrowOneItem(int index, IItem originalItem, Vector2 velocity)
     {
         //Remove the item from the item container
         //从物品容器内取出物品
@@ -837,7 +838,7 @@ public partial class CharacterTemplate : CharacterBody2D
                 break;
         }
 
-        originalItem.Quantity -= 1;
+        ProtectedItemContainer?.RemoveItem(index, 1);
     }
 
 
diff --git a/scripts/inventory/ItemSlotNode.cs b/scripts/inventory/ItemSlotNode.cs
index f1f3db9..34ce733 100644
--- a/scripts/inventory/ItemSlotNode.cs
+++ b/scripts/inventory/ItemSlotNode.cs
@@ -114,7 +114,7 @@ public partial class ItemSlotNode : MarginContainer, IItemDisplay
     /// </summary>
     private void UpdateTooltipText()
     {
-        if (Item == null)
+        if (Item is PlaceholderItem or null)
         {
             TooltipText = null;
             return;
@@ -149,6 +149,12 @@ public partial class ItemSlotNode : MarginContainer, IItemDisplay
             return;
         }
 
+        if (Item is PlaceholderItem or null)
+        {
+            _quantityLabel.Hide();
+            return;
+        }
+
         switch (Item?.Quantity)
         {
             case null or 1:
@@ -178,11 +184,8 @@ public partial class ItemSlotNode : MarginContainer, IItemDisplay
 
     public void Update(IItem? item)
     {
-        if (item is not PlaceholderItem)
-        {
-            Item = item;
-            UpdateAllDisplay();
-        }
+        Item = item;
+        UpdateAllDisplay();
         UpdateBackground(item is { IsSelect: true });
     }
 
diff --git a/scripts/inventory/UniversalItemContainer.cs b/scripts/inventory/UniversalItemContainer.cs
index 24e8969..5bbd4da 100644
--- a/scripts/inventory/UniversalItemContainer.cs
+++ b/scripts/inventory/UniversalItemContainer.cs
@@ -230,6 +230,12 @@ public class UniversalItemContainer(int totalCapacity) : IItemContainer
             item.Quantity = 0;
             _itemDictionary.Remove(itemIndex);
             UpdateNextAvailableIndex();
+            ItemDataChangeEvent?.Invoke(new ItemDataChangeEvent
+            {
+                NewItem = item,
+                NewIndex = itemIndex,
+                Type = Config.ItemDataChangeEventType.Remove
+            });
             return originalQuantity;
         }
 
@@ -239,6 +245,12 @@ public class UniversalItemContainer(int totalCapacity) : IItemContainer
         {
             _itemDictionary.Remove(itemIndex);
             UpdateNextAvailableIndex();
+            ItemDataChangeEvent?.Invoke(new ItemDataChangeEvent
+            {
+                NewItem = item,
+                NewIndex = itemIndex,
+                Type = Config.ItemDataChangeEventType.Remove
+            });
         }
 
         return removed;