I've been searching this BL Manga, it's goes like the MC is a Vampire Hunter and his Father got killed by a Vampire and the Seme is a Vampire and perhaps the Lord of all Vampires and he's interested in the MC and eventually took MC to his castle
https://www.mangago.zone/read-manga/blue_blood_vampire/
Yess that's it Thank you!
I've been searching this BL Manga, it's goes like the MC is a Vampire Hunter and his Father got killed by a Vampire and the Seme is a Vampire and perhaps the Lord of all Vampires and he's interested in the MC and eventually took MC to his castle