Stranger

On a foggy night, two college students drown at the beach. While Shi Mok investigates, Yeo Jin tracks down a man who was at the scene of the incident. 

Police and prosecutors each prepare members for joint discussions on investigative authority. Dong Jae brings Woo Tae Ha some cases of interest. 

Yeo Jin recruits Gun. Digging into a policeman's death ruled as suicide, Shi Mok and Dong Jae find signs that point toward a different story.

 In a heated first session with prosecutors, Gun makes a pointed argument. At Hanjo, Lee Yun Jae faces an oncoming family power struggle. 

At the prison to interrogate an inmate, Yeo Jin runs into Shi Mok and Dong Jae. Choi Bit has Yeo Jin deliver a mysterious file to an assemblyman. 

Shi Mok is ordered to find out what Yeo Jin knows about Bit's file. Ahead of a vote on the fate of her seat, Yun Jae sets up an important meeting. 

When Shi Mok hears who's gone missing, he starts gathering clues by going through phone records. Yeo jin begins her own investigation. 

Leading police effords to lcoate Dong Jae, Yeo Jin connects the case to that of the dead policeman. Shi Mok pays Yun Jae a visit.

A perplexing photo containing a disturbing message surfaces. The police consider the possibility of the culprit being one of their own.

 Shi Mok turns his attention to an unusual case involving the sudden death of a former prosecutor, and finds that nothing quite adds up.

A witness, who says he saw the kidnapping, steps forward to identify the perpetrator. His claims could mean serious trouble for the police. 

Taken off the case, Shi Mok and Yeo Jin return to their work on the police-prosecutor council. Tae Ha and Bit head to a sensitive meeting together. 

Kang Won Chul weighs a dilemma, and fields questions from Shi Mok about the deceased attorney. A young prosecutor has something to show Shi Mok. 

A suspect is arrested, but Dong Jae remains nowhere to be found. In the interrogation room, Shi Mok and Yeo Jin try to draw out a confession. 

While getting to the truth about the night of the attorney's death, Shi Mok and Yeo Jin learn about the involvement of a mystery person. 

Details of the cover-up become public, but Shi Mok isn't finished asking questions. The police-prosecutor council is called off.

As a teen, prosecutor Hwang Shi Mok received surgical treatment for his abnormally developed brain, but the procedure left behind serious side effects.

The convict's strong plea for his innocence prompts Shi Mok to review the CCTV clip. At the Yongsan police station, he runs into officer Han Yeo Jin.

Shi Mok volunteers to appear on live national TV to discuss Kang Jin Sup. He also makes a bold promise to find the culprit within two months.

Rumours quickly spread about Shi Mok's violent nature. Regardless, he persists in his investigation. He finds his mentee, Young Eun Su, suspicious.

Shi Mok, puzzled by the details of the most recent murder case, visits the victim's home to seek more clues. Yeo Jin joins him in the investigation.

New pieces of evidence only increase the list of possible suspects. In the midst of the confusion, a few begin to question Shi Mok's innocence.

Shi Mok and Yeo Jin team up to covertly pursue Seo Dong Jae. Just as Dong Jae is about to throw something into the Han River, Yeo Jin stops him.

Enraged by what the police did to Park Kyung Wan, Yeo Jin tries to confront her superior but is stopped by Shi Mok, who warns her of the consequences.

Shi Mok selects key lawyers and police officers to be part of the special investigations team. Their probe begins with Dong Jae as the starting point.

Fearing for Ga Young's safety, Yeo Jin proceeds to transfer her to a different hospital. A nurse informs Yeo Jin of something strange that happened.

The truth behind Ga Young's convulsions is revealed. Chang Jun's wife receives a travel ban. Woo Gyun asks Chang Jun to help him get out of his mess.

Shi Mok and Yeo Jin discover perplexing leads while searching Kyung Wan's basement. Dong Jae goes back to Chang Jun's office to fetch his cell phone.

Returning home from the rooftop party, Shi Mok discovers that an intruder has left something in his bedroom. Yeo Jin and Gun come over right away.

Yeo Jin suspects a new killer is involved in the latest murder incident. Meanwhile, Shi Mok collapses after leaving the autopsy.

Yeo Jin collects evidence as Shi Mok interrogates the suspect. Many questions get answered, but the most important problem of all remains to be solved.

Shi Mok sets out to meet the one he believes is the real murderer. He gets his hands on a bag that will determine the futures of many people.