When psychological counselor Lin Xu was treating a trauma patient, his consciousness was accidentally anchored to the night before the crime, and he was forced to "possess" a different client every night, witnessing the countdown to death. He must collect clues in this infinite loop of "tonight", and the person in charge of the case is Gu Yao, the detective's ex-girlfriend who was cruelly pushed away by him seven years ago and is now as cold as ice. When the pursuit in reality collides with the perspective of all living beings in the dream, the two are forced to join forces in a puzzle of intertwined reality and reality. This time, what they want to solve is not only a complicated and confusing murder case, but also each other that is buried deep in their hearts and has never really let go.
