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When Park Jung Hwan (Kim Rae Won), the head of the anti-corruption investigation team for the Supreme Prosecutors' Office, finds out that he has a malignant brain tumor and only has six months left to live, he makes the decision to deliver one last blow to the criminal underworld before he passes away. Before he dies, he wants to make sure that he has done everything he can to bring down the corrupt. In spite of the fact that he was formerly a dishonest chief who was willing to make concessions in order to further his career, Park has made the decision to redeem himself by bringing down the dishonest Public Prosecutor General Lee Tae Joon (Cho Jae Hyun). Shin Ha Kyung, his ex-wife and the mother of his child, who divorced him due to the fact that he was only interested with power and status and who is now an upright prosecutor herself, agrees to assist him in his ardent quest. Shin Ha Kyung is also the mother of his child. Park is resolute in his pursuit to restore his reputation in the eyes of the public, but can he also do it in the eyes of his family?