Less than Evil

Tae Seok is a detective who's tormented by a pang of guilt that he missed the culprit that murdered a high school girl named Yeo Wool in 2005. Now Tae Seok meets with a prosecutor, and he turns out to be a suspect who killed Yeo Wool in 2005. Meanwhile, a housewife gets abducted, Tae Seok starts to investigate.

With a strong belief that Prosecutor Jang Hyun Min is the abductor, Tae Seok starts to look into Hyun Min’s background and past. When he sneaks in Hyun Min’s house, he’s reminded of when Yeo Wool and Soo Ah ended up being killed and the police failed to prevent the murders in 2005. After relentlessly pursuing the culprit, Tae Seok finally arrives at the crime scene where he finds the abductee.

Prosecutor Jang Hyung Min who fell from the stairs gets taken to a hospital, but he remains unconscious. The police higher-ups discuss whether to punish Tae Seok for letting Hyung Min fall and get severely injured. However, Tae Seok has already decided to resign. Meanwhile, Seon Jae's parents get murdered and Eun Jae calls the police.

Tae Seok continues to suspect that Reporter Eun Seon Jae is a psychopath killer who murdered her parents and dog. Rather than getting frightened or denying, Eun Seon Jae seems to enjoy getting suspected and even shows off how clever she is. And as Tae Seok keeps provoking her, she threatens someone precious to Tae Seok.

Tae Seok finds Yeo Wool's name tag from Seon Jae. He questions how she knows Yeo Wool, but Seon Jae only gives a vague answer. Tae Seok starts to look into the relationship between Yeo Wool and Seon Jae and who Seon Jae really is. Meanwhile, the police receive a new murder case where two officers have gotten killed.

Seon Jae tries to poison Song Man Soo who is in prison now and asks him why he killed Yeo Wool in the past. He says it was Jang Hyung Min who killed Yeo Wool, and not him. In the meantime, the man who murdered two police officers shows up again, and this time, he shoots more officers with a gun in front of Tae Seok.