Season 1

Yong Deok is found dead. The UDC investigates about it. They first look into his past.

Mr. Ko tells the truth about Yong Deok's past. The two apparenly suffered from the industrial accident.

Yong Deok is left to rest with his daughter. Like her father, she was also a victim of TL's recklessness.

UDC receives an anonymous call. There's a respiratory disease occurring at the TL Medical Center.

Min says that the hospital will cooperate with the UDC on the investigation. Joong Eun checks on Do Yoon.

UDC loses its authority to investigate the disinfectant case. The Ministry of Health gets involved.

Joong Eun and the UDC figure out how to go about the humidifier disinfectant case. Tae Young helps out.

Min Ki finds clues from Yong Deok that help UDC find the culprit behind the chemicals.

Tae Young tells Joong Eun to make a move towards his office. They check what's inside the safe.

Joong Eun is out, while Se Rin is left alone. Young Gil's hideout is infiltrated.

Joong Eun realized that Seo Rin is missing. He submits a testimony that stirs up the courtroom.

Tae Young returns from prison. Joong Eun vows to rectify the wrong of the TL Group.