Vampires exist. They have an underground kingdom. You and your brother Sunghoon are vampires that secretly live with humans. For the first time your brother has friends (Heeseung and Jake) over for a sleepover. When you saw Jake you instantly fell in love. But he's human. What you don't know is that Heeseung is the vampire prince and wants to make you his. Sunghoon even promised you to him.

It's night. You left your room for a glass of water, when suddenly cold hands grab your waist