diff --git a/src/Controllers/Common/ContentController.cs b/src/Controllers/Common/ContentController.cs
index bcfd348..3599d23 100644
--- a/src/Controllers/Common/ContentController.cs
+++ b/src/Controllers/Common/ContentController.cs
@@ -714,7 +714,8 @@ public class ContentController : Controller {
         --invItem.Quantity;
 
         // get real item id (from box) add it to inventory
-        itemService.OpenBox(req.ItemID, out int newItemId, out int quantity);
+        Gender gender = XmlUtil.DeserializeXml<AvatarData>(viking.AvatarSerialized).GenderType;
+        itemService.OpenBox(req.ItemID, gender, out int newItemId, out int quantity);
         ItemData newItem = itemService.GetItem(newItemId);
         CommonInventoryResponseItem newInvItem = inventoryService.AddItemToInventoryAndGetResponse(viking, newItem.ItemID, quantity);
 
@@ -745,6 +746,7 @@ public class ContentController : Controller {
     public IActionResult PurchaseItems(Viking viking, [FromForm] string purchaseItemRequest) {
         PurchaseStoreItemRequest request = XmlUtil.DeserializeXml<PurchaseStoreItemRequest>(purchaseItemRequest);
         List<CommonInventoryResponseItem> items = new List<CommonInventoryResponseItem>();
+        Gender gender = XmlUtil.DeserializeXml<AvatarData>(viking.AvatarSerialized).GenderType;
         for (int i = 0; i < request.Items.Length; i++) {
             int itemId = request.Items[i];
             if (request.AddMysteryBoxToInventory) {
@@ -760,7 +762,7 @@ public class ContentController : Controller {
                 }
             } else {
                 // check for mystery box ... open if need
-                itemService.CheckAndOpenBox(itemId, out itemId, out int quantity);
+                itemService.CheckAndOpenBox(itemId, gender, out itemId, out int quantity);
                 for (int j=0; j<quantity; ++j) {
                     items.Add(inventoryService.AddItemToInventoryAndGetResponse(viking, itemId, 1));
                 }
@@ -784,8 +786,9 @@ public class ContentController : Controller {
     public IActionResult PurchaseItemsV1(Viking viking, [FromForm] string itemIDArrayXml) {
         int[] itemIdArr = XmlUtil.DeserializeXml<int[]>(itemIDArrayXml);
         List<CommonInventoryResponseItem> items = new List<CommonInventoryResponseItem>();
+        Gender gender = XmlUtil.DeserializeXml<AvatarData>(viking.AvatarSerialized).GenderType;
         for (int i = 0; i < itemIdArr.Length; i++) {
-            itemService.CheckAndOpenBox(itemIdArr[i], out int itemId, out int quantity);
+            itemService.CheckAndOpenBox(itemIdArr[i], gender, out int itemId, out int quantity);
             for (int j=0; j<quantity; ++j) {
                 items.Add(inventoryService.AddItemToInventoryAndGetResponse(viking, itemId, 1));
                 // NOTE: The quantity of purchased items is always 0 and the items are instead duplicated in both the request and the response.
@@ -1095,11 +1098,12 @@ public class ContentController : Controller {
         // NOTE: we haven't saved any changes so far ... so we can safely interrupt "fusing" by return in loops above
         
         var resItemList = new List<InventoryItemStatsMap>();
+        Gender gender = XmlUtil.DeserializeXml<AvatarData>(viking.AvatarSerialized).GenderType;
         foreach (BluePrintSpecification output in blueprintItem.BluePrint.Outputs) {
             if (output.ItemID is null)
                 continue;
 
-            itemService.CheckAndOpenBox((int)(output.ItemID), out int newItemId, out int quantity);
+            itemService.CheckAndOpenBox((int)(output.ItemID), gender, out int newItemId, out int quantity);
             for (int i=0; i<quantity; ++i) {
                 resItemList.Add(
                     inventoryService.AddBattleItemToInventory(viking, newItemId, (int)output.Tier)
@@ -1295,7 +1299,7 @@ public class ContentController : Controller {
             if (itemService.ItemHasCategory(rewardItem, 651) || rewardItem.PossibleStatsMap is null) {
                 // blueprint or no battle item (including box)
                 List<CommonInventoryResponseItem> standardItems = new List<CommonInventoryResponseItem>();
-                itemService.CheckAndOpenBox(rewardItem.ItemID, out int itemId, out int quantity);
+                itemService.CheckAndOpenBox(rewardItem.ItemID, gender, out int itemId, out int quantity);
                 for (int i=0; i<quantity; ++i) {
                     standardItems.Add(inventoryService.AddItemToInventoryAndGetResponse(viking, itemId, 1));
                     // NOTE: client require single quantity items
diff --git a/src/Services/ItemService.cs b/src/Services/ItemService.cs
index ce8cc9b..13c1ae5 100644
--- a/src/Services/ItemService.cs
+++ b/src/Services/ItemService.cs
@@ -45,7 +45,7 @@ namespace sodoff.Services {
             return random.Next(1, (int)itemData.MaxQuantity + 1);
         }
 
-        public ItemDataRelationship OpenBox(ItemData boxItem) {
+        public ItemDataRelationship OpenBox(ItemData boxItem, Gender gender) {
             var boxRewards = boxItem.Relationship.Where(e => e.Type == "Prize").ToArray();
             int totalWeight = boxRewards.Sum(e => e.Weight);
             if (totalWeight == 0) {
@@ -55,22 +55,27 @@ namespace sodoff.Services {
             int win = random.Next(0, totalWeight);
             foreach (var reward in boxRewards) {
                 cnt += reward.Weight;
-                if (cnt > win) {
+                if (cnt > win && CheckItemGender(items[reward.ItemId], gender)) {
+                    return reward;
+                }
+            }
+            foreach (var reward in boxRewards) { // do again in case high `win` value and CheckItemGender fail
+                if (CheckItemGender(items[reward.ItemId], gender)) {
                     return reward;
                 }
             }
             return null;
         }
 
-        public void OpenBox(int boxItemId, out int itemId, out int quantity) {
-            var reward = OpenBox(items[boxItemId]);
+        public void OpenBox(int boxItemId, Gender gender, out int itemId, out int quantity) {
+            var reward = OpenBox(items[boxItemId], gender);
             itemId = reward.ItemId;
             quantity = GetItemQuantity(reward);
         }
 
-        public void CheckAndOpenBox(int boxItemId, out int itemId, out int quantity) {
+        public void CheckAndOpenBox(int boxItemId, Gender gender, out int itemId, out int quantity) {
             if (IsBoxItem(boxItemId)) {
-                OpenBox(boxItemId, out itemId, out quantity);
+                OpenBox(boxItemId, gender, out itemId, out quantity);
             } else {
                 itemId = boxItemId;
                 quantity = 1;