I Just read chapter 45 and he told Junghwi the truth and then hypnotised him too, i don't know what's he going to do now that he hypnotised him but i guess he is either going to force Junghwi to treat Wooyeon badly through hypnosis or he is going to make Junghwi accept that Woojin is sexing wooyeon.
at this point they are all polyamorous, the only one who seems monogamous or slightly possessive is Yoel.
I can't help but feel a bit uncomfortable by that threesome, maybe it's because i didn't anticipate for the original uke to have sex with MC too or maybe the fact that during this threesome that argio has more chemistry with the original uke than with the MC ( ̄へ ̄)