You are a girl who studies in an elite school in South Korea, your brother, Niki, has 6 friends in this school, Heeseung, Jay, Jake, Sunghoon, Sunoo and Jungwon. Since you're not popular and you don't have a lot of friends, they're nice and welcome you from time to time. What you don't know, is that most of them are vampires. And one of them, Heeseung, is obsessed with you, but he hides it really well.