Connection

Narcotics detective Jang Je-gyeong is put into a dangerous situation. A friend contacts him for the first time in years.

Je-gyeong attends a funeral with old friends. The reading of the will reveals an unexpected list of names for a generous insurance payout.

Jae-gyeong and Oh Yoon-jin track down one of the beneficiaries. Indecision over an autopsy for Park Jun-seo's body leaves the group divided.

As the investigation into Lee Myeong-kook's history with Jun-seo continues, the team is led to believe that someone is hiding evidence.

Evidence tampering disrupts the investigation into Myeong-kook, while internal conflicts arise in the police department.

The team connects the case to past events and people, fuelling suspicion about Jun-seo's death. Je-gyeong goes undercover to follow a lead.

Yoon-jin uncovers an unexpected connection. Je-gyeong follows a new lead involving a taxi and a black SUV.

After learning a group of friends were at the construction site the day Jun-seo died, the police interrogate them in hopes of finding a new lead.

Further questions reveal clues about what happened on the night of the murder, but a slip-up in the investigation leads to a suspect on the run.

An undercover mission reveals unresolved issues relating to the case. Je-gyeong tracks down the person he believes led to his addiction.