Anesthesiologist Lu Yan (played by Sun Qian) encounters her friend Deng Man (played by He Hongshan) who has been dead for many years on her way to the night shift. Strange things happen around her one after another.In the process of finding out the truth, Lu Yan's ex-boyfriend who had broken up with her many years ago, detective Jiang Chengyi (played by Huang Jingyu), was also involved.The truth that had been hidden for eight years was revealed step by step.