Su Lin, a third-rate suspense novelist, boarded the legendary "ghost train" - the K444 green train in order to find inspiration.
Legend has it that the seventh carriage of this train mysteriously disappears every midnight.
Su Lin thought it was just an urban legend until she discovered that the ticket she bought happened to be for the seventh carriage. The passengers in the carriage are all kinds of people, and they all look like ordinary people.
The clock struck twelve o'clock at midnight, and the carriage shook violently. Instead of the fleeting scenery outside the window, there was a bottomless, sticky darkness. The passengers in the carriage had weird smiles on their faces and began to play a killing game called "Who is the outsider?"
