Park Jung-Hwan, head of the anti-corruption investigation team, has spent his career sacrificing his morals for power. When diagnosed with a terminal brain tumor and given only six months to live, he decides to target the corrupt Public Prosecutor General, Lee Tae-Joon, in a final attempt at redemption. To expose the truth, Jung-Hwan enlists the help of his ex-wife, Shin Ha-Kyung, a principled prosecutor who left him years ago because of his ruthless ambition. As they work together, Jung-Hwan struggles with whether he can redeem himself in the eyes of his family, especially his estranged son, before it’s too late.