When he was a youngster, which caused him to lack 17, hwang Shi-Mok had brain operation. Now, Hwang Shi-Mok works like a prosecutor. He is cold and lonely, although rational. He is also among the sole prosecutors not involved in corruption. One day, a dead body has been thrown infront of him. He matches Police Lieutenant Han Yeo Jin at a murder crime scene. They interact to eradicate corruption at the prosecutor's office and also solve a serial murder case.