Seven years ago, a bizarre disappearance known as the "Hundred Ghosts Tunnel" took place on Jiangcheng Metro Line 18. The last train and more than a hundred passengers vanished without a trace. The authorities covered up the truth, and the incident became an urban legend. Seven years later, Li Zhen, a young metro safety officer, is unexpectedly assigned to work aboard the last train on this eerie line.
From the first midnight he steps aboard Train 1804, his peaceful life is shattered. Joss paper, faceless passengers, stations that shouldn't exist, interrogations from the underworld...
