Synopsis: Jo Kyung-Min, a single woman who works for a bank, lives a nine-to-five life, shuttling alone through the streets of the city.This night, Kyung-Min returned home from work, found the password lock lid of the door was opened.Shortly after entering the room, she heard a password-locking sound coming from the door, and some people tried to twist the handle.Although did not see anyone, but panic Kyung-Min still chose to call the police, however, the police refused to investigate further with no intrusion and injury.Night gradually deep, in the very abnormal deep sleep, it seems that what people calmly walked into the room of Kyung-Min, tightly holding the girl to sleep.The following days, Beijing Min's mental state is getting worse and worse, unreasonable customers are let her feel panic. She starts to get overwhelmed, every man around her seems incredibly suspicious, and something terrible finally happens...