The story of doctors who try to uncover the truth behind industrial accidents, factoring in real-life occupational hazard events in South Korea.
Dr. Jung-eun and Dr. Heo Min-ki delve into industrial accidents and occupational diseases - regardless of the reason, partner or ripple effect.
A fight between Heo Min-ki and UDC occurs as they try to track down the hidden evidence behind a tragic screen door accident.
Jung-eun joins UDC in the wake of the screen door incident and takes her first steps into a long battle with the TL group, led by Tae-young.
Min-ki struggles to solve a baker's asthma case. Meanwhile, Jung-eun senses that there is a scary truth behind a subway accident.
Jung-eun finds evidence of mercury contamination in an abandoned building. However, she and the UDC face threats as they get closer to the truth.
Jung-eun and Min-ki carry out an operation to save Do-hyung. Meanwhile, the UDC tries to find evidence of mercury poisoning.
As the UDC investigates a mysterious murder case, Min-ki and Jung-eun face a mixed meeting that determines their fate.
Jung-eun and Min-ki face a mischief-like fate in the emergency room. Meanwhile, the UDC struggles to determine the cause of Hyemi's blindness.
Deprived of its investigative powers, the UDC enters into close-knit investigation of a methanol blindness incident that is spiraling out of control.
Jung-eun is forced to cooperate with TL Group due to the UDC being held hostage. With even Seo-rin threatened, Jung-eun has only one option left.
Min Ki investigates the past of the late Kim Yong-duk. Meanwhile, a respiratory illness of unknown origin begins to spread throughout the country.
Min-ki looks into the past of the late Kim Yong-deok. Meanwhile, a respiratory disease of unknown origin begins to spread across the country.
The UDC and TL group are in a fierce battle over the cause of the epidemic respiratory disease, which is spreading out of control.
As the humidifier disinfectant situation spreads, Tae-young and Jung-eun accept a deal to stop TL's sabotage.
What was the information Tae-young wanted to convey to Jung-eun? Meanwhile, the UDC tries to track down a terrorist while Sung-guk approaches Surin.
On the witness stand, Jung-eun decides to gather the voices of her conscience and deliver them, hoping for a world where work doesn't hurt.
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