Responses
Just a theory but can be spoiler I think...
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I think his father cheated his mother with a man or men and his mother got so upset and be very how should I say "this is not something we can discuss" and keep say to him "guy and guy is disgusting" nor " don't be like your father" and I think it happened when he was a teenager or when he was just a mere child because of that he travmatized and maybe when time passes he finds out he is gay and hate it more, hated himself.
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It is just a theory and idk what really happened so it could be wrong
I read somewhere in a manhua that "The more you are a homophobe or the more u are afraid of Homosexuals, the more u are a homo inside" so i think he's gay.