Diary of a Prosecutor

The Jinyeong Branch, in the end of the southern coast of Korea, is called the prosecutors' place of exile. Prosecutor Lee Sun-woong of Criminal Unit 2 spends each day without any desire or ambition.

Prosecutor Cha Myung-joo voluntarily goes to Jinyeong instead of resigning; prosecutor Lee Sun-woong is disappointed.

Sun-woong starts off on the wrong foot with Myung-joo in a battle to win Jung-woo's favour; an old woman's sudden visit to the Jinyeong branch causes a butterfly effect among the prosecutors.

Sun-woong and Myung-joo clash over the unpaid wages case. Their conflict continues after they are assigned to the same case.

Unit 2 receives a tip about a gambling ring in Jinyeong. Sun-woong, who's the best card player of the unit, personally teaches Myung-joo about the game of Hwatu so she can infiltrate the ring undercover.

Myung-joo's father drops by unexpectedly and makes Sun-woong feel uneasy with his eccentric behaviour.