之前買的時候放庫裡吃灰，最近幾天突然就迷上了，因為之前買的是普通款，現在突然降價就想買個終極版於是寫了篇不算小作文的小作文
Hello, dear stm customer service
I was deeply attracted by this game because I saw it on the video website. Now I want to buy the ultimate version of this game, but there is no upgrade package. So I want to refund the ordinary model and buy an upgraded model. I hope you can understand, thank you.