korean manga? not a webtoon or manwha. it was in black and white. black haired guy and one of them was a vampire? sorry for being so vague.
Vampire Library? http://www.mangago.zone/read-manga/vampire_library/
korean manga? not a webtoon or manwha. it was in black and white. black haired guy and one of them was a vampire? sorry for being so vague.