On a bright and sunny day, a group of medical students—He Xinyue, Xiao-Li Ma, Ng Yen Yen, Leiyong Han, Yang Gang, and Zeng Ping—decide to visit an abandoned old school. Six months prior, the school was the site of a strange murder involving a woman, which sparked chilling rumors about a ghostly presence linked to the phrase “friends, back to back.” Despite the unsettling legend and the traumatic fear it once instilled, these daring young individuals choose to ignore the warnings of the school’s caretaker, Master Qin, and opt to stay for two days. As night descends, a sense of unease grows, with fleeting glimpses of a ghostly figure and the stirring of hidden desires within their hearts.