In modern society, there are people who are neglected and suffering. They are often involved in unfortunate events, such as industrial accidents, and end up dying. Most of the disasters could be prevented in advance with little attention. However, some companies or public organizations tend not to prepare for potential accidents because of the high cost. That’s how industrial accidents take place. Doctor Detective is a drama where medical doctors treat the patients suffering from industrial accidents and look into the truth behind the accidents. The story of the drama starts when Joong Eun, who is an enormously talented medical doctor, gets to join an undiagnosed disease center(UDC) in the middle of experiencing difficulties in her personal life. And she starts to look into her patients' diseases caused by industrial accidents and work on revealing the truth concealed by those with power.
Episode 1
Joong Eun makes a living out of concealing industrial accidents. Il Sun and him run into each other.
Episode 2
Joong Eun realizes that her neighbor is not safe and stable. She interferes and makes him get a check-up.
Episode 3
Joong Eun is determined to get to the bottom of Ha Rang's death. Sung Kook takes matters into his hands.
Episode 4
Min Ki does some investigations and finds concrete evidence. Joong Eun gets in touch with the victim's mom.
Episode 5
Ha Rang's funeral is held without the autopsy being performed, and his colleagues offer condolences.
Episode 6
Young Han suffers sickness and goes to see Il Sun. Joong Eun starts to investigate the bakery.
Episode 7
Joong Eun almost gets into an accident. Min Ki gets out of the police's custody. Now, they fight for justice.
Episode 8
Joong Eun finds a way to get the bakery closed down for sexual violence. The asthma case is on hold.
Episode 9
Joong Eun gets attacked by a hitman. The question whether or not she survives arises. Do Myeong is arrested.
Episode 10
Il Sun and her team find out about Ha Rang and Do Hyeong's mercury poisoning.
Episode 11
Tae Young tells Joong Eun to expose the TL Group's coverup, and attempt to take down Sung Kook.
Episode 12
The members celebrate a job well done. The mercury poisoning case goes well. This, however, is short-lived.
Episode 13
The police visit the UDC to collaborate on the case. Min Ki and Ha Rang find something out.
Episode 14
Joong Eun meets her ex-father-in-law. She tells him to stop pressuring the UDC. Choi Gon collapses.
Episode 15
Someone suspects Joong Eun had something to do with the Chairman's condition.
Episode 16
Joong Eun infers that methanol used in the machines caused her blindness. The folks at UDC find out.
Episode 17
To find evidence against the TL Group, Joong Eun and Min Ki look into the factory in disguise. They get leads.
Episode 18
Min Ki goes to the hospital room. He meets Hye Mi and breaks into tears. Joong Eun also pays a visit.
Episode 19
The chairman shows Joong Eun a threatening letter he recently received. Tae Yong gives compelling advice.
Episode 20
UDC starts to dig into the letter threat. They presume that it was from a victim of a TL Group accident.
Episode 21
Yong Deok is found dead. The UDC investigates about it. They first look into his past.
Episode 22
Mr. Ko tells the truth about Yong Deok's past. The two apparenly suffered from the industrial accident.
Episode 23
Yong Deok is left to rest with his daughter. Like her father, she was also a victim of TL's recklessness.
Episode 24
UDC receives an anonymous call. There's a respiratory disease occurring at the TL Medical Center.
Episode 25
Min says that the hospital will cooperate with the UDC on the investigation. Joong Eun checks on Do Yoon.
Episode 26
UDC loses its authority to investigate the disinfectant case. The Ministry of Health gets involved.
Episode 27
Joong Eun and the UDC figure out how to go about the humidifier disinfectant case. Tae Young helps out.
Episode 28
Min Ki finds clues from Yong Deok that help UDC find the culprit behind the chemicals.
Episode 29
Tae Young tells Joong Eun to make a move towards his office. They check what's inside the safe.
Episode 30
Joong Eun is out, while Se Rin is left alone. Young Gil's hideout is infiltrated.
Episode 31
Joong Eun realized that Seo Rin is missing. He submits a testimony that stirs up the courtroom.
Episode 32
Tae Young returns from prison. Joong Eun vows to rectify the wrong of the TL Group.
