First of all, Jiwon and DG are so pure and adorable and wholesome I could cry. He really did something out of himself there, it is just wonderful that he reflected on his faults and his such a nice bf now.
About MG and Chiwoon... the slap was obviously BDSM play. That's what you do and if that is too much for the sub, they can say the safe word. I don't see how it's that dramatic. On the other hand both of them acted kinda stupid, maybe even naive. Both of them don't have positive experiences which is why they probably don't have a way with words. After the last chapter I am sure they will manage things and it will even be as healthy as Jiwon x DG. Some relationships have a complicated start and that's what I love about this story. Because it's real. And sometimes things have to be shitty in order to become beautiful.
I know. BDSM is partly about "I tell you what to do and if you don't you will be punished". Also, he did way 'worse' things to him than that slap, think about his badly bruised butt. That there were feelings involved that made the situation very uncomfortable is nothing I want to disapprove, though slapping is and always will be a part in those sexual plays. Sorry man.
I am sorry to say this but he kinda deserved it. Played with so many people and now he got the UNO reverse card move. This is what I call karma and I hope he learns for the future that using people is a really bad idea. There is always that one day when you fuck with the wrong person. And that person will give you the same^10.
Lol, I just knew that Cicero was the killer.