Mc had black hair, ml has grey hair. he was tall he joined the dinner with a friend “ only day he appears to be free” he joined bc mc was there and ml hair was black. It’s not a 3p that’s all I can remember. In later ep the rival vampire gave him mc a keycard to go in ml basement, where he found an old portrait of himself.
https://www.mangago.me/read-manga/b1_1/
Found it, it's so hidden, top 10 lists and it's not mentioned in one

Stillll looking Lf a vamp story that started out to his friend inviting him out for dinner, he gets too drunk goes back w ml drinks the wine from his fridge but It was actually his blood. He started to get hot since his blood makes u horny