Lin Xiao, a female worker at an old garment factory, stayed behind alone in the dormitory during the holiday to save on travel expenses. Due to a water leak in her room, she temporarily moved to the next room. In the middle of the night, she was awakened by the sound of a chainsaw, and subsequently saw a bloody photo of her coworker Li Hong's tragic death in the dormitory group chat. Moments later, coworker Li Hong's account unexpectedly sent a message claiming it was a prank. As the coworkers, awakened in the middle of the night, complained in resentful reprimands, the night shift security guard went to inspect, and after the inspection reported that everything was normal. While everyone breathed a sigh of relief, female worker Lin Xiao received a message from coworker A Qiang.