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Kim Young-koon (Seo Kang-joon) first encounter with prosecutor Han Tae-joo (Kim Hyun-joo) and detective Do Chi-Gwang (Han Suk-kyu) takes place moments after witnessing the murder of his mother and his father’s sudden arrest.  

Fifteen years later, he is recruited to the Internal Affairs Unit to investigate corruption within the police force. Determined to uncover the truth behind his mother’s murder and the circumstances leading to his father’s imprisonment, he works alongside Do Chi-gwang, Han Tae-joo and Park Joo-hee to expose the truth.  However, he soon learns that the course of justice does not ring true as allegiances and loyalties constantly change, leaving him questioning everyone’s (and his own) motivations.