Born to a human mother and a vampire father, Yeon Seo is a 118-year-old half-vampire who wants nothing more than to live an ordinary human life. With her natural beauty and a host of vampire abilities, Yeon Seo could be anything she wants, but she has chosen to blend in with those who seem closer to her age. But when the sweet blood of her classmate, Song Meo Roo, catches the attention of vampires and werewolves, things get a little complicated. Desperately trying to ignore the siren call of Meo Roo’s blood, Yeon Seo takes it upon herself to protect her classmate from those hunting him. As Yeon Seo and Meo Roo race for their lives, the blood in her veins calls to her. Torn between her family duties and the desires of her heart, a war rages within Yeon Seo.