I don’t think he dislikes him, I think ryeong just has a lot of history that leaves him in an isolated position emotionally. So he cares for paljae but he draws a line for himself not to cross bc “it can’t possibly be” sort of thing.
He also shares history with paljae that neither of them clearly remember for various reasons, so there might be subconscious stuff in play with that as well.
We know that Munreyong doesn't remember because his human memoried were sealed away
Wait I forgot why does the white haired guy seem to dislike the black haired guy?