
I'm tired people saying that Guwon is faking his emotions, he's not, from what we've seen he's always exhausted, clearly everything is taking a toll on him even though he doesn't understand WHY because he's not human, he doesn't understand how humans work but he can FEEL it's wrong unlike so called humans who voted for his death.
It might seem like Guwon is leader but I think humans are just using him for their dirty job since he's "innocent" since doesn't understand how society works and how humans are and he's just doing what humans want him to do.
So instead of being a manipulator how readers want him to be, he's the one who is being manipulated by humans.

I don't think he's jealous or worried he will leave him for his brother but instead worried that his brother will shit-talk about him as usual and it will change his feelings or something.
Which won't happen obviously but we should keep in mind that his brother has been basically isolating him from everyone his whole life and changing people's perceptions of him.
I still think the one controlled is Guwon and humans are just using him as a pawn because
1) if he makes everyone so miserable, they could let him die, everyone has a skill to survive in this town but they still chose to keep him alive.
2) I don't trust the doctor when he said he killed his kids, because then why other kids are in this town if they're not "useful" in Guwon's eyes. He even was searching for a teacher for them.
3) When he was saying "complicated" words he probably was repeating what humans been drilling in his brain to convince him to do all the dirty job.
I don’t think he’s lying.
1) They were dying in the apocalypse without Guwon, why would they just let Guwon die and go back to the apocalypse.
2) It could just be that he met Guwon in an earlier stage of development. We see how innocent or unaware Guwon is at seemingly normal things. He tells the MC to teach it to him. It could be that when the doc first met Guwon he hadn’t learnt the importance of children yet. But now he has a town and he wants to maintain the town and obviously then you’d need children otherwise what will happen to the population.
3) point is possible.