Hyunjin had just gotten in a relationship with you because his crush didn't get in a relationship with him... He was a year older than you and you had confessed him first so he thought.... "Okay.. I'll get in a relationship I'm bored too, i need a little timepass". That's why he got in a relationship with you. But most of the time he ignored you in school and left you for delivered 12 hrs and shit. He still had a crush on that girl while being in a relationship with you...

He has made fun of your face, looks and doubted you. He was manipulative and a sucker.