it does not matter if the victim enjoyed it or not. as op+author said, this is noncon. hyowon literally ✊?'d seohyun in while seohyun was drunk. that is not consensual behavior. after seohyun kept telling him to stop, hyowon still pressured seohyun into doing it.
don't give "get out of jail free" cards to characters who show noncon behavior just because they're hot