Punch

Park Jung Hwan is the chief of the anti-corruption investigation team for the Supreme Prosecutors' Office. To get to his position, he has made compromises on achieving justice. Jung Hwan then learns that he has a malignant brain tumor and does not have much time to left. To end his life without regrets, he points a gun at corrupt Public Prosecutor General Lee Tae Jun. Jung Hwan’s ex-wife Shin Ha Gyung, who is also a prosecutor, knows about Jung Hwan’s situation and helps him.
(Source: AsianWiki)