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Prosecutor Jae-wook, specialized in violent crimes, detests the criminals and doesn't give a damn about their human rights. One day, while interrogating Jin-seok, a suspect looking insincere, Jae-wook loses his temper again and beats him. The next morning when Jae-wook comes back to the interrogation room, he finds Jin-seok dead. Jae-wook is charged with murder and arrested and the Prosecutors' Office including Jae-wook's boss and close colleagues desperately tries to find a way out of this trouble leaving him as a scapegoat. Jae-wook claims his innocence but gets sentenced 10 years of prison.

In prison, Jae-wook gets to meet with a handsome petty criminal Chi-won and finds the clue of the scheme which puts him in the prison. Jae-wook asks Chi-won to join the forces with him and starts to train Chi-won to reveal the scheme and get his revenge done.