Eun-A lost her family at the hands of a serial killer. She is now mentally and physically destroyed. She then decides to get revenge by enlists the help of four people from different life to fulfill her revenge.
Joo-hyeop is a serial killer living in countryside hiding his identity. When his son befriends a girl who is the only person that knows his true identity, Joo-hyeop decides to kill her for the sake of him and his son.
Detective Squad Chief Choi is set for a promotion for his work and his reputation. After the party with his colleagues he falls victim to a wrong taxi-driver who tries to rob him, but gets killed accidently by Chief Choi. Choi fears about his promotion and decides to cover up the murder. He hides the body and the car and then goes home. But the next day the body he thought to be hidden is hanging from a crane and circles around the newspapers. Chief Choi is shocked and takes on the investigation in order to erase all traces that could lead to him. But at the same time, a mysterious phone call starts brings the already feared Choi to the edge.Written by