Spoilers

I really loved this novel (even if it's super toxic, it's a lot, thankfully it's just fiction, minors shouldn't read this) i can give you spoilers:
-So in the end he falls for Inseop, he knows he's sick and tries do adjust to be with him but still does the worst things to Inseop. He's a jealous and possessive guy, so the rest of the novel revolves around that narrative, him being jealous and doubting Inseop, he thinks he runs away when they're in the US for some acting job Wooyeon had, he hides his passport but thinks Inseop got it and abandoned him. He tried to control everything, but becomes a nervous wreck when he can't find Inseop (who was just buying some cake somewhere), when he returns he basically rxpes him and confesses his obsession with him crying and Inseop gives up and returns "his love confession", mind you, he knows he's manipulating Inseop but he doesn't care as long as he stays with him (I know, Inseop is dumb af, but he is in love with Wooyeon...sigh...). When they get together they return to SK and fxck like bunnies and Inseop gets stabbed by a stalker for being too close to Wooyeon. Between the stabbing and misunderstandings around Inseop wanting their relationship to be normal and Wooyeon's jealousy, Wooyeon decides to forget about Inseop, they grow apart but in the end, they get together again because they're in love with each other (in their super toxic way). To avoid Inseop running away and in an attempt to be in a "more normal" relationship (because Wooyeon acts like a psycho) he quits everything to be with Inseop and they move to a house in the US near Inseop's family. In the end he keeps Inseop and Inseop is also happy with his toxic man. The end.