
So um does the uke knows/remember what he did to seme? (because some people said that he gangraped him as i far as i remembered? Idk) and at the end of this manhwa, what is their situation with e/o?

he doesn't remember, but he'll remember later.
as for their relationship, what the person above me said. seme doesn't beat the uke nearly as much, most of it is choking and slapping. the uke becomes a nymphomaniac who gets off on pain (i suppose that's how he has to survive).
anyway, one part of the novel did make me really sad:
Even though Park Juyeon had matured, he was still Park Juyeon. As a look of displeasure slowly spread across his pretty face, Kwon Jiwook's heart sank slightly.
"No, so don't misunderstand, okay?"
".." (this is juyeon)
There was a long exchange of looks. After a silent battle with the now gloomy beauty, Kwon Jiwook's energy drained away, and he quietly lowered his tail, nodding.
"... Yeah, sorry. I was wrong. Do you want to hit me with a fist or and open hand?"
Noooooooooooo