DARK MOON: Kuro no Tsuki - Tsuki no Saidan

Welcome to Riverfield, where the most popular boys at two rival schools happen to be vampires and werewolves. When a mysterious new student, Sooha, transfers to Riverfield, the rivals find themselves inexplicably drawn to her. As horrible incidents start to shake the town, the boys’ forgotten pasts slowly start to unravel… and their world turns upside down.

(Source: WEBTOONS)