Can do- from this point, you can interpret JiWook as either experiencing Stockholm syndrome or actually falling for JuYeon. I'm gonna abbreviate names
JW + JY go out for a club meet up where SuHyeok finally sees JW, he pieces together that some shits happening between them. JW ends up seeing SangMin?( the big guy) + another guy who was enemies with JW from middle school (I forget his name but he's somewhat friends with JY)
Fast forward, SH helps JW escape with the help of SM. They get caught by JY and middle school enemy guy.
This is JY's big revenge- he beats up SH for helping JY escape and dp's JW. Then invites JW's old middle school enemies to gang on him. While this is happening, SH wakes up and asks JY why he's doing this to JW, so JY tells SH what happened to him/why he hates JW. Also bc JW has memory loss- he's also learning of what their history was as he's getting ganged
After it's done, JY takes JW to a hospital and when JW wakes up- they talk and JY confronts him and asks him whether he believes what he said/if JW will own up to it. JW does, this is JY's forgiveness moment where he asks JW if he wants to keep living with him/be together on the condition where it's no more running away + they are actually a 'couple'
When they go back home, JY takes care of JW and they're somewhat patient/caretaker dynamic until JW starts getting mental disturbances and initiates more romantically with JY. He has a 2 suicide attempts where JY breaks down when he catches him.
Much, much later- their dynamic, JW drops out where JY graduates. JY's dad is $$$ and pays for his life, so their life and they become more couple-like, its implied JY resparked his middle school crush on JW and feels like he's the love of his life and JW is so (in love/indebted/mentally changed/controlled/idk you pick your interpretation) with JY- that he's super submissive. They bang a ton, also implied that JW's preferences are so skewed from all the gang, that when they do have sex, it's pretty rough
As summarized as I could get, lmk if I can explain more

I need to read the novel because with everything going on I need to know how they end up together