Seven years ago, a bizarre disappearance occurred in the "Hundred Ghost Tunnel" on Jiangcheng Metro Line 18. The last train and hundreds of passengers disappeared. The truth was covered up by the authorities and became an urban legend. Seven years later, young subway safety officer Li Zhen was accidentally assigned to ride the last train on this weird line.
From the first midnight he set foot on train number 1804, his peaceful life was completely broken. Paper money, faceless passengers, stations that should not exist, inquiries from the underworld...
