A cute guy with an angelic face? Check. A cold and aloof outsider with a cat? Check. A class full of vampires? Check... Wait, what? All her life, Seonha Shin has lived in the shadow of her sister, Seonghye, who is one year older than her. Luckily, there is one thing Seonha does better than her sister—donating blood! When Seonha gets special admission into a prestigious university as a blood donor, she finally starts to feel like the main character of her life. Little did she know she'd be surrounded by vampires!