Responses
It's not entirely their fault to hate a character coz as you can see yahwi is a bitch at the first half of the story. Cain is loving person and he loves jooin, (even if he was (indeed) reincarnated from being a dog to a human and follow his master).
Just try to put your shoes on jooin, like your ccrush or love ones treat you like a trash or worse than that, who would've been angry with that? Just sayin'.
People really showing their simple by hating a complex character with faults and loving a literal man with a dog soul