When Park Jung Hwan (Kim Rae Won), the chief of the anti-corruption investigation team for the Supreme Prosecutors' Office, learns that he has a malignant brain tumor that gives him only 6 months to live, he decides to throw his final punch at the criminal world before he says farewell to life. While he was once a dishonest chief himself, making compromises to achieve his position of power, Park decides to redeem himself by he taking down the corrupt Public Prosecutor General Lee Tae Joon (Cho Jae Hyun). In his passionate pursuit, he recruits the help of Shin Ha Kyung, his ex-wife and mother of his child who divorced him because he was only concerned with power and status and is now an upright prosecutor herself. Park is determined to redeem himself to the world, but can he also redeem himself in the eyes of his family?