beta
Maybe I'm late but none of the comments are speaking on Jaehees past, it's explains tremendously why he's so fucked up in the head and allowing Cheonho to abuse him for the slightest inconvenience and also why he seems so hypersexual. Jaehee has no father, and had an extremely busy mother that trusted her brother to take care of him while she worked, and instead of helping his sister out, the uncle brought women and fucked them right next to a child Jaehee assuming that he'd forget about it because he's still a baby(I'll assume he's like 5-6 in the flashback) and he'd see new faces from his uncle and mother constantly so stability and a healthy relationship was never a thing for him.
And when Jaehee grew up, he fucked around with people, probably under the influence of the sexual shit his uncle used to do. And everytime he'd date someone, they'd leave him. This made him extremely starved for true attention and care, and in his eyes Cheonho actually staying and letting him live with him was more than what he'd expected from someone, making him allow Cheonho to do anything as long as he doesn't leave him/kick him out. It's been a recurring theme that Jaehee seems dreadful of the day that Cheonho might get bored of him like all his other relationships, and his lack of communication makes small misunderstandings turn into serious issues, not to mention constantly being used.
I feel so utterly bad for Jaehee, he clearly just wants love and can't express in other ways other than sex which comes from his hypersexuality that can be from the fact his uncle shamelessly used to fuck women Infront of young Jaehee, which altered his brain chemistry in a way.
God Jaehee you're actually such a beautifully written character(〜T-T)〜