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; Lee Sun Woong is disappointed.

Sun Woong starts off on a wrong foot with Myung Joo in a battle to win Jung Woo's favor; meanwhile, 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 go undercover.

Myung Joo's father drops by unexpectedly and makes Sun Woong feel uneasy.