Lin Shen, a down-and-out graduate, takes on a strange, high-paying assignment - playing the role of the husband of a rich girl until her "end of life." The employer, Shen Man, is gentle and mysterious, but never goes out. All the clocks in the villa are turned backwards. After living according to a "Life Guide" for three months, Lin Shen discovered her portfolio in the basement, as well as a quantum machine that maintained "her" existence. It turns out that Shen Man died of illness five years ago, and now she is just a consciousness that is about to dissipate. Lin Shen faced the final choice: take the balance and leave, or spend the last three days with this "non-existent person" before his consciousness collapsed?