I understand where you're coming from, but it just feels so finite. In life, no matter how bad things are, there are limitless possibilities. But in death, well... I guess it depends on what you believe in. I believe in reincarnation and even knowing I'll be born again, it still feels very limited. I'd rather exist in this life with all my memories than have to start again from scratch. Shit, this is depressing me just thinking about it. Would you really rather die than have to go through an apocalypse? Like, really really?
It'll probably end with him finding happiness in his own way, and then using that to heal (and by "heal" I mean living freely and happily). If that means getting with his rapist, then so be it. It's fictional, so there's way more room for change and character growth than if this was a real world scenario. Remember Low Tide in Twilight?
Sr to cut in, I suppose you're a lot like our MC here, Seonho, alway trying to hold to life even in the worst time. In chapter 61 raw, spoiler
Seonho seduces/tries to stop the white-haired mutant from changing his body by offering his bussy. Seem like the dude has liked Seonho since their school days, he's excited by Seonho and he takes advange of that.

At this point I would have just offed myself. He was staying alive to save his friend and then his friend turned into a worse piece of shit, not to mention everything his body has been through. Actually I would have done it a long time ago how much longer does he have to suffer???? Put the poor thing out of his misery