Kinda, their relationship I think ends more or less like “we are both kinda fcked up and ínstense, who else would ever be able to handle us, well guess we gotta stick together”
Well, if you count the seme raping the uke multiple times and then throwing him away and then the uke coming back for revenge against him and the authorities who sent him to a suicidal mission , then ,yes. They will end up together
spoiler (of literally the whole main story):
almost dies, get back to get the blueprint, gets r**ed again, gets locked up at that dude's place in an inhabitant island, tried to escape several times and gets r**ed every time, finally escaped after almost dying from broken neck, goes back to korea and becomes a wanted man, apparently the higher ups framed him, reunites with that psyco ass dude (and tf is up with writers but they do it after reuniting even tho the uke almost died bc of the seme), uke realizes dude's got stockholm syndrome, the framing and problems get solved, end of story, extras in volume 5.
What. the. hell. I need spoilersss. What happens next? Are they actually gonna end up together!?