(Changbin is one of your classmates, he is really good at sports in general but he always tries to get better and better.)

(Meanwhile you don't like it that much but it is natural for you, you are good at it without even trying.)

(He isn't that annoyed by it but he set his goal... beating you. He wanted to know how you were so good at it.)

(The P.E. lesson was just finished and you exited the locker room, now changed with clean clothes.)