
Suicidal genes, body that makes him sexually exploitable thus making him very self conscious and even more suicidal, addict with chances of demon bursting and killing him, decaying organs because of drugs, now a sex slave and pregnant with rapist fetus, wich makes him hate his body even more.
And rapist GF seems to hate him so most probably she is gonna try kill him.
Besides, he is Jin's Achilles' heel.
For the plot to keep going, Jin needs to join with rest of the main cast, the scanners. With Charin around Jin wouldn't join them. Being forever whith Charin is what Jin wishes.

Yeah, but i think Charin arc it's too much, it's just misery after misery. I don't think it needed even more misery.
I mean did it need to make him even more miserable for being pregnant after all the rape ... right before he dies? I mean, in the timeline he just discovered he is pregnant and in the same day he is gonna get killed.
He already got enough self hatred to make the plot angtsy. The dude was already mentally a mess, this just adds another layer of cruelty.
Why do some of you think that the blond guy's gonna die? It won't be him who dies... I saw the raws and someone else dies soon.