That boy is traumatized, he's literally acting like she assaulted him. Now that I think of it, maybe we should be more serious about this?? Was miae's actions Sexual Harassment? We know that if Miae did that to another boy Cheol would lose his mind with jealousy. At the same time, Cheol is not ready for intimacy of any kind.
I'm waiting for when this psycho figures out that his hyung is dating junghwi sunb.i know sunb is not endgame, i hope he doesn't stay with all this tomfoolery.