
It's honestly interesting. It's clearly shown he knows right from wrong but the fact that nobody has called him out on it is more a curiosity to him than anything which I find intriguing. Then Guwon is deeply impressed and pleased at the thought that Jinwoo has a moral compass and calls him out on his actions. THAT adds another engaging side to Guwon that makes me want to know more.
It's not a complex story so far but I do appreciate how the characters are written.

Although he's now being influenced by humans, one of Guwon's personalities knows what good and evil are because he said something like, "Finally, someone who can differentiate between good and evil."
He feels so happy that someone corrected him and he broke out of the mold.
So... one of his personalities is aware of ethics and morals.
And another personality acts like a robot.
Another personality acts like a child learning to live in the world, to feel emotions.
In short, it's very interesting!
The author has made it clear that Guwon is like an empty vessel. He can't form him own opinions. He just takes what's textbook correct. He can't think of complexity, any depth or realize the conception of moral dilemma. I see a lot of commentors putting this character into a box and just straight up calling him evil. No he's too stupid to even be evil.