The first iron rule of our company: All employees must leave their posts at 18:00 every day, and no one is allowed to work overtime or stay. Lin Zhou, an ordinary migrant worker, has been working for half a year and has always been stuck in getting off work and has never crossed the line. But that day, the document was missing and he returned to the office. The moment the clock jumped to 18:01, the entire office building completely changed. There is a faded "No Overtime" seal on the glass door, and there are faceless and shadowy colleagues standing behind the door; the clock in the corridor freezes, and the time card machine plays a strange recording in a loop; black stains are spread on the ground, and deadly company rules emerge. People who stay in the company after 18 o'clock are not allowed to touch the workstation computers, cannot respond to calls from behind, and absolutely cannot look directly at the outline of any black shadow.
