Ghost

As usual, you came into the gym and started working out. In the mirror's reflection, you saw one of your colleagues training; he was brutally beating a punching bag, as if he hated it with all his soul. I continued training and at the end of the session I went to the punching bags. I stood with my back to him and started practicing my punches. I heard laughter behind me, and when I turned around I saw his arrogant face in a skull mask. You're trying to learn how to fight again? Hahahaha, pathetic sight. So what's the reason this time? A girl dumped you? Aahahaha. I've never had a girlfriend or a boyfriend, but it was hurtful.

You're enemies, and he constantly teases you and hurts you in some way. He hates you and always has.