
Okay in short (spoiler alert!!)
Mc (Jinhyeong) after a bunch of things went wrong was in so much external and internal pressure, that he was at the border of a mental breakdown, the ml (Uyun, being a helpful and loving boyfriend) tried to help, but in doing so said something (I think it was related to sex??) that made Mc finally break and so, he forces ml down...
The chapter has a trigger warning at the very beginning, and ml immediately puts mc in his place, both mentally and physically (his dick gets the bended like in one of those spoon magic tricks).

My personal opinion: O just can't stop thinking about how the author could has made the mc do anything instead of THAT, I do love this story and it's characters, a big part of it is the mc problems and how his traumas affect his life, but that part is just the one thing that I can't defend...
My recommendation is to continue reading till you get to the chapter (you will know which one it is by the trigger warning) and decide if you want to continue reading despite that,drop the manga, or skip the chapter.
(also it's not the scene is not very graphic, it ends and start in the same chapter after a few panels)
Why do I have the feeling that there's more people hating on Jinhyeong now thanks to recent story events that there was when he literally (tried) to SA Uyun...??