Xu Mian, who had graduated from Yancheng High School five years ago, was forced to enter a nightmare because she kept staying up late at work and fainted at the company. This nightmare brought her back to the abandoned high school campus two years ago, and she experienced a bizarre escape journey. After that, for several nights, the nightmare continued. Is this the sequelae of excessive fatigue, or is there another reason? What kind of secrets does Yancheng High School have that closed suddenly two years ago? Can you break through the layers of nightmares and return to sweet dreams?