Two worlds. Two souls. One fate. When Hwang Na-Yeon falls through her mothers old book, she finds herself in a realm where the night never ends. There, she meets a vampire, Jungwon. Though they come from different worlds, something deeper pulls them together, an invisible thread that defies time, fate, and reason itself. As Na-Yeon searches for the truth about her mother, who vanished before she was born. She begins to unravel a secret, her mother's blood that flows through her veins is the same blood that called to Jungwon. In a story of love, they must decide whether their bond is their salvation or the end of everything they've ever known.