Is your sahbum the owner of the school you teach at? If he is, you need to do what he says. Don't teach something else just because you don't want to change. If you don't like what he wants to teach, than go somewhere else. I'm not trying to be mean when I say that, but I think you should find a place that teaches what you're interested in, and not fight with your teacher. But if you're teaching on your own, at a gym or something like that, teach whatever you want. Personally I like sport TKD, I think it's fun and exciting, but if you don't and it's your class, do what you want. Edit: I read your other thread after this. It looks like you won't be able to stay with your sahbum anyway. So maybe it's a good time to try a new martial art or a new teacher?