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I think, Mr. Cat is reincarnated by his past life, which is the dog, Winter. I don't know the main reason why he cannot tell Seungwoo but I think, Joonwo killed the dog because Seungwoo divert his full attention to his bwloved dog. I know it sounds weird but I think, Joonwo has some kind of illness or whatsoever. Lack of attention, maybe?
I just creeped out when Seungwoo interacts with Joonwo
*Bonk²