There are a lot of things we don't know yet about this character so far. We know he is really good at playing tennis and it was something he got into because of his father.
Is it something that he truly wanted or is something he chose to do it because his father wanted it? Sometimes children who are good at one activity believes that they have always wanted to do it, but deep down they have other interests.
When the principal asked him he liked something other than tennis, he couldn't answer. I mean you can love a sport and still appreciate other activities. Even professional athletes have other interests.
When this scene happened, I thought maybe he just wanted to spy with his other account on Bay's account. They have this weird rivalry-attraction going on so it wouldn't be a surprise.
But what if it was something else too? What if he likes art too? What if he wanted to make art too or is curious about it, but thought he couldn't do it. Is it because of his dad or is it because Bay does it too?