don't you have a person that you trust very much? now imagine you being in love with them on top of that. won't you also act like nakyum there?
also bcoz we see the teacher being a fucking piece of shit does not mean nakyum knows too. what happened at the market was his first time realizing that the teacher does not really care about him. and who knows, maybe farther down the line he will realize that... BOTH OF THEM ARE FUCKING MONSTERS AND HE NEEDS TO GET OHT OF THERE ASAP!
I also think that age and environment plays a role. He looks quite young to me (I would be surprised if he was even over 18) and I'm not sure but I think he was an orphan? His naïveté could be stemming from these. Plus he trusts the learned sir (too much imo) and he is in love with him. Love can blind people, especially young and impressionable people.

Yeah yeah Nakyum's all fluffy and cute, but he's annoying.
How is he so naive to be blinded by that asshole? I don't like the lord either, but at least he doesnt hide behind a facade.