Yu Meng used to have the power to control his dreams. Yet not only is his ability gradually disappearing, but he has also suddenly plunged into nightmares filled with monsters. Once, he seriously injured his mother when struggling during a nightmare. When he awoke, he had an existential crisis and tried to end his life. He planned to jump off a winding highway surrounding a hill, but instead dragged another girl, Li Jingjing, into the nightmare. They then started their adventure within the nightmare.