In modern-day Seoul, Karina, an elite vampire assassin from the ancient House Moongrave, is sent to eliminate a seemingly ordinary law student named Minjeong-her name marked for death by the vampire clan. But when Karina meets Minjeong face-to-face, she hesitates...... Torn between duty and a growing love, Karina defies her orders and seeks the truth-before the woman she loves is killed by the very world Karina once served.