In a small seaside town, two schoolgirls are assaulted by a middle-aged man in a motel. Mia, a teenager who was working on reception that night, is the only witness. For fear of losing her job, she says nothing. Meanwhile, 12-year-old Wen, one of the victims, finds that her troubles have only just begun. Trapped in a world that offers them no safety, Mia and Wen will have to find their own way out.
A series of gruesome mruders takes the city by storm. Each crime is elaborately staged and executed with high level of skillfulness. All murders have something in common: The victims are subjects of recent media controversy when their apathetic, selfish wrongdoings cause the death of others. The way they were executed also bears resemblance to certain details of their misdemeanor. The media immediately labels it an act of vigilante justice and the whole town becomes enthralled with the serial killer. People are frantic to see his next act of gigilantism. Police detective Nam, who's been assigned to the case, is practically running out of leads and time. She enlists the help of ex-cop/forensic expert Mu, who quickly discovers invisible traces of evidence left at the crime scenes. Together they are wasting no time in hunting the killer before the next murder occurs. At the same time, the serial killer has chosen his next victim. He is plotting a live streaming of the execution for people to decide on the fate of the victim. Seeing himself as the guardian of the city, he believes true justice can only be served by transferring power from the law enforcement and giving it back to the people.
Madame Tang colludes and mediates between the government and the private businesses for the benefits of her all-female family. One case does not go according to plan, and an entire family close to Madame Tang fall victim to a gruesome murder. Ambition, desire and lust eventually change Tang's relationships with her own family forever.