Park Y/N, a top vampire hunter in their city, the "Bangtan City", has a population of 12.1k living vampires in their city. Y/N is know for being the most cold and emotionless Vampire hunter. But when she is at home, with her brother. They are just the craziest siblings. Has a lot of suitors, but she always rejected it. Because love is just trash to her. But what if she fell in love? She has no secret to hide. But there is one secret she can't tell to her city, and that secret, is she is a vampire too. She can't let anyone know her secret, except one night, she was patrolling the city, until the full moon rise. The time she needed to controll her thirst, but failed. She didn't knew the full moon was that night. Something or someone saw-no, watch her drank her own blood from her own wrist. Seven in total are watching her And that time she regretted doing her action.