theories

Maybe he's not human or a mutant or something

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Guwon might actually be an evolved zombie(?) and our MC, Jinwoo, might have some experience hunting down said zombies. His first kills might be his parents and he blanks out to mask the trauma that goes with killing them? His reaction in that past chapters was too fast for me to excuse it as casual.

As for Guwon not having memories...I call half bullshit. Half coz I feel like he knows more than he lets on but has very little interest in exploring what his brain is missing. His strict rules of 'order' might also stem from the legitimate want for a 'human' community that he's striving to be a part of.

Also, I feel that his interest in Jinwoo is genuine. I believe he's manipulative tho. He may want to be intimate with Jinwoo but doesn't know what that intimacy entails. So, I think him being all happy about his 'charm' is sincere coz he's getting what he wants and he's quite pleased where it's heading.

I'd be lucky if at least one of my theories is correct