Chinese language is replaced with "?" in response

Hello everyone, i am using SOAP UI 5.0.0. I have create a rest mock service to return JSON data. Data is expected to have chinese, but when i request my mock service, it simply returns "?" instead of Chinese characters. Below is my JSON response which is added in the response.

[{
                "CCRQ": "2006\/1\/26 0:00:00",
                "CLXH": "CA6510B1",
                "CarBodyColor": "深绿云母金属色",
                "FDJH": "1",
                "Trim": "陆地巡洋舰GX-R-4.7-AT四驱(国Ⅱ)[200701]",
                "TrimId": 6889,
                "BuyPrice": "21.2200",
                "CCSJ": "2007",
                "GSNK": "啊",
                "Make": "一汽丰田(长春)",
                "MakeId": 101,
                "Model": "陆地巡洋舰",
                "ModelId": 281,
                "NewPrice": "64.9000",
                "SellPrice": "23.5800"
}]

however upon requesting mock service, chinese characters in response are simply replaced with "?" as shown below. Please advice what should i do? Native Look and feel option is already checked.

[{
   "CCRQ": "2006/1/26 0:00:00",
   "CLXH": "CA6510B1",
   "CarBodyColor": "???????",
   "FDJH": "1",
   "Trim": "?????GX-R-4.7-AT??(??)[200701]",
   "TrimId": 6889,
   "BuyPrice": "21.2200",
   "CCSJ": "2007",
   "GSNK": "?",
   "Make": "????(??)",
   "MakeId": 101,
   "Model": "?????",
   "ModelId": 281,
   "NewPrice": "64.9000",
   "SellPrice": "23.5800"
}]