In my own opinion, this is really f'd up. Yuna is such an a$$hole, rather than having a proper talk with Minji, what did she do? She initiated a sexual intercourse that is rough and abviously not to Minji"s liking.
Yuna i'm waiting for your character development.
I don"t care if this opinion of mine will anger some Yuna apologists/fanatics. Y'all hating on Minji that she's with Jihoon, when he is literally making a move on her like taking her out to dates, Yuna in the other hand can't even initiate a proper talk about their "relationship" but has the guts to initiate a sexual intercourse.