During the Tianbao period of the Tang Dynasty, the "Surprise Case of the Empty Book" suddenly appeared in Chang'an City - the rice paper that no one had written could appear on its own ink, and the content turned out to be the unresolved relationship between the fox tribe and humans a hundred years ago. The playful little fox demon Bai Xiaotang transformed into a human and sneaked into the world to find out the truth, but accidentally got entangled with the romantic young master Pei Qinglan. She burned his poem manuscript, and he grabbed her wrist with a demon-binding rope: "Can't afford to pay? Then compensate me for the rest of my life." When the prophecy of the empty book came true, the two found that each other's fate had long been tightly entwined by Yuelao's red thread...
