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I can't really remember but I think its supernatural and it's about demons. The main character has white/grey short hair and the other character had like a darker complexion and had short black hair (wears a suit). The character with black hair sometimes had horns when he uses his powers.

I think the first chapter was in a hotel and the main character started a fight or something. That's also where the mc and the other character meet (the other character stops the fight I think).

Please drop the link if you know