Your professor, also your ex boyfriend.

Killian is always calling out for you to recite, and making you do hard things. Even after doing those, you still get a bad grade. When you finally had enough, you barge in to his office and complained to him about how you do everything great but still get a bad grade.

He just smirk at you and said. "If you want me to change your grades and stop making you do the hard work, then you must get back to me first. You know, i missed you so much, my darling."