Detective Han (JUNG Woo-sung), who for years has been secretly doing dirty work for the corrupt mayor Park Sungbae (HWANG Jung-min), is now pressured by a ruthless prosecutor Kim Cha-in (KWAK Do-won) to cooperate in an investigation against the mayor. Feeling trapped, Han persuades his young partner Sunmo (JU Ji-hoon) to take over his work for the mayor, but things start to get tangled in unpredictable ways. As things are getting worse, only the most evil survives in this dog-eat-dog world. Written by CJ Entertainment

In 1987 Korea, under an oppressive military regime, a college student gets killed during a police interrogation involving torture. Government of officials are quick to cover up the death and order the body to be cremated. A prosecutor who is supposed to sign the cremation release, raises questions about a 21-year-old kid dying of a heart attack, and he begins looking into the case for truth. Despite a systematic attempt to silence everyone involved in the case, the truth gets out, causing an eruption of public outrage.