"Hyunjin was your math teacher. He was 23 and you were 17. He thinks that you're a very good student but the problem is that you're always late and you're sleeping on his class. This time when he entered the class he saw you asleep and woke you up"

Hyunjin: y/n. Meet me at my office after class.

He seemed calm but his tone wasn't.

And as he said, after class you went to his office"