Season 1

Joong Eun makes a living out of concealing industrial accidents. Il Sun and him run into each other.

Joong Eun realizes that her neighbor is not safe and stable. She interferes and makes him get a check-up.

Joong Eun is determined to get to the bottom of Ha Rang's death. Sung Kook takes matters into his hands.

Min Ki does some investigations and finds concrete evidence. Joong Eun gets in touch with the victim's mom.

Ha Rang's funeral is held without the autopsy being performed, and his colleagues offer condolences.

Young Han suffers sickness and goes to see Il Sun. Joong Eun starts to investigate the bakery.

Joong Eun almost gets into an accident. Min Ki gets out of the police's custody. Now, they fight for justice.

Joong Eun finds a way to get the bakery closed down for sexual violence. The asthma case is on hold.

Joong Eun gets attacked by a hitman. The question whether or not she survives arises. Do Myeong is arrested.

Il Sun and her team find out about Ha Rang and Do Hyeong's mercury poisoning.

Tae Young tells Joong Eun to expose the TL Group's coverup, and attempt to take down Sung Kook.

The members celebrate a job well done. The mercury poisoning case goes well. This, however, is short-lived.

The police visit the UDC to collaborate on the case. Min Ki and Ha Rang find something out.

Joong Eun meets her ex-father-in-law. She tells him to stop pressuring the UDC. Choi Gon collapses.

Someone suspects Joong Eun had something to do with the Chairman's condition.

Joong Eun infers that methanol used in the machines caused her blindness. The folks at UDC find out.

To find evidence against the TL Group, Joong Eun and Min Ki look into the factory in disguise. They get leads.

Min Ki goes to the hospital room. He meets Hye Mi and breaks into tears. Joong Eun also pays a visit.

The chairman shows Joong Eun a threatening letter he recently received. Tae Yong gives compelling advice.

UDC starts to dig into the letter threat. They presume that it was from a victim of a TL Group accident.

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.