
That line icked me too.. I thought he finally understood what was happening between them from the start, that it's bdsm..but no. I think the uke is so vulnerable emotionally cause of its past trauma that any negative or sudden change pushes him to take extreme actions..like that scene from his parents and now this conflict. The ambiguity of their relationship also plays the part of this misunderstanding. So yeah its gonna be rocky ride from here

Cuz he's confuse as well himself and I think that's because of lack the of relationship with others and lack of knowledge with what they're doing (little faucet didn't know bdsm and play etc). His only reference of sex is the rape that happened to him, that's why he's always so nervous and won't stop crying when they're doing the act and whenever Juwon's spaks him (he thought it was abuse or something) this is also the reason why he felt different the first time they have vanilla sex (i forgot the chap but I think before s1 ends), if only he didn't lie at the beginning that he doesn't have any experience about sex (he said it's not his first because of the traumatic incident that happened and it's not his fault because everyone around him even his mother are using the "boys will be boys" card) or if Juwon take his word with a grain of salt specially when Seodan's always crying and nervous during their meet ups.
I don't get the uke. He literally finds pleasure and stress relief out of their sessions usually, so why does he suddenly think that "if he cared about me he wouldn't beat me"? It just seems to be a weird step backwards for them when they were getting along. Just because he told him he should work somewhere else?? Idk I'm confused. (Yes of course he should have stood up earlier, but I'm confused why he's doing it now I guess)
(Obviously this isn't healthy but you people read this knowing it was "bdsm to keep your job" so you have literally no room crying like babies about toxicity and them breaking up when you know damn well it will work out for them because BL logic. )