The heroine, Lin Wanwan, transmigrates into the role of the “white moonlight,” who gets just three lines in the original book: “Gu Yanche's only warmth. She died in an accident, and from then on Gu Yanche became a demon.” She has three days to prevent her death and stop Gu Yanche from turning evil. But once she starts taking action, she discovers cracks in the world: people who “aren't in the book” are watching her in secret. And the gloomy boy, Gu Yanche, sometimes looks at her with a flash of understanding and grief that “shouldn't belong to a seventeen-year-old.”
