Park Jeong Hwan, the leader of the anti-corruption investigation team at the Supreme Prosecutor's Office, had compromised his principles to achieve his position and seek justice. However, he later discovered that he had a malignant brain tumor and his time was running out. Determined to end his life without regrets, he aimed his gun at the corrupt Chief Prosecutor Lee Tae Jun. Jeong Hwan's ex-wife, Shin Ha Gyeong, who was also a prosecutor, knew about his situation and assisted him.

Jeong Hwan's decision to confront Lee Tae Jun was not driven by revenge or personal gain, but rather by his desire to expose the truth and bring justice to the corrupt system. Despite the risks involved, he was determined to sacrifice himself for the greater good. Ha Gyeong, understanding the weight of Jeong Hwan's burden, stood by his side, providing him with the support and assistance he needed. Together, they embarked on a dangerous journey, fighting against powerful enemies and uncovering the dark secrets hidden within the system.