Noblesse: Rai's Adventure(2016)

Noblesse: Oejeon

Rai, the noblest of all vampires, wakes up from 820-years long sleep and starts his new life as a student in a high school founded by his loyal servant, Frankenstein. But his peaceful days with other human students are soon interrupted by mysterious attackers known as the "Unions".

(Source: WEBTOON)