Four people traveling in a van run over a lone woman while she is walking in the dark down a country road. After loading her into the vehicle to take her to the nearest hospital, they notice that she is behaving rather strangely. The occupants of the van soon realise that the time has come to fight for their lives, and together they agree on one very simple rule: "do not sit next to her."

Xiao Xian is in charge of finishing a dress. Her mother has decided that she is going to take care of it that night, and she obeys, as usual. Sheng Xia, her best friend, shows up at her house to convince her to go partying. Xiao Xian accepts, but she cannot imagine what will end up happening that night.