I would really love to see some more detail into this story which has some great characters. Use similes and metaphors to describe the world around us and also to help us better understand the MC's emotions.
Also, for a game about boxing, it feels empty when you don't establish things like north pole and south pole stances, actually teaching the mc how to throw a punch, make a proper fist, where to hold your fists in your stance. It's important to do these things so we can find the story believable, understand the growth of the MC, believe that Tiger actually knows what he is talking about, and it will be fun and engaging for the reader to learn something.