
We actually don't know anything substantial about his origins unless you have access to info we don't know about. Also "not in his right mind" and "modified human" are a contradiction; using terms like "psychopath" for him doesn't make sense. If he's not "totally human" why would terms created for "total humans" apply to him? If he's genetically programmed to act that way then that is his right mind....again according to your own opinion.

my assumption was that Guwon was just using him because he got a new experience that he never had before and he's just really dumb... my theory for him throwing up was that he just thought it was nasty cuz he didn't understand it, but liked it after positive reinforcement I guess??
now I realize that it might be a combination of what I thought and that he's genuinely just fucked in the head

Of course we don't know anything and I don't have any prior info but there have been plenty of nuances and hints about him being not being your average human. One, recall in the previous chapter he didn't know anything about SLEEPING. It was a first time thing for him. No human can go without sleep. Secondly, his manner of socializing suggests he had little exposure to human interaction from an early age. See how he is inquisitive about things in general which he is learning alongside the kids. A man his age should have been ahead in terms of thought capacity. There are so many examples not forgetting his lack of knowledge on sex unless he is pretending and let us not forget how his body looks like he has undergone multiple surgeries. As for his psychopath description, Its obvious it stems from his lack of moral understanding of the VALUE of human life and moral ethics. The man stole medicine meant for his son and you and I know there are plenty of simple punishment measures but that brutal killing which showed him looking excited spurred by chants from the people suggests psychopathic tendencies. And let me stress, this is indeed just my opinion

honestly, i completely agree with you. idk what guwon is but human is barely one of them. the weird black arm tattoo things i can tell if its decaying skin cuz he's like a pieced together puzzle or actually just a tattoo. there's so many weird things like why does he own lube if he doesn't have sex or jerk off??? it feels all planned like he knew it would happen
The comments in the section be showing surprise about Guwon. The moment he vomited after the kiss was a clear flag he isn't is his right mind. And we all know Guwon isn't totally human but a modified human. How would you expect him to be less than a psychopath if he is genetically programmed to maintain order at all cost?