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A female victim is taken to the hospital with seven stab wounds on her body. She says that her boss tried to kill her, however, the suspect denies all the charges against him. Prosecutor Eun Sol is in charge of the case, and at the trial, she encounters Doctor Baek Beom who comes to the court to provide his expert opinion on the stab wounds.
Eun Sol continues to find more evidence related to the case and visits the female victim’s house. Meanwhile, two members of a gang are found dead, and Baek Beom is asked to perform autopsies on them. In the middle of the autopsy, unexpected guests visit Baek Beom and his colleagues.
Eun Sol goes to meet Baek Beom without knowing that he’s been taken hostage. Before she opens the doors of the building, she realizes that something is going wrong. Inside the autopsy room, Baek Beom finds out that who took the drugs among the thugs.
Baek Beom starts to perform an autopsy on Kang Ah Reum’s dead body. Eun Sol pushes him to finish the autopsy before the trial ends. Meanwhile, Gal Dae Cheol attends the trial as the prosecutor and reveals a shocking video clip that shows what happened between Kang Ah Reum and Jin Sang Chul in the women’s restroom.
A married couple dies in two different car accidents almost at the same time. After their death, the bereaved families of the husband and the wife starts to fight over the inheritance. In order to find out the time of death of the two people, Baek Beom and Do Nam perform autopsies on them.
The prosecution and the NFS continue to work hard to find out the truth behind the couple’s death. Through security camera footage and a background check on Cha Do Hee, the female victim’s sister, Eun Sol realizes that Cha Do Hee has fabricated the time of death of her sister.
Everyone believed Cha Joo Hee died in a car accident, but according to Baek Beom’s opinion, her accidental death is now a homicide. And based on a chemical substance found in the female victim’s body, the female victim’s sister Cha Do Hee is now the prime suspect.
The prosecution and the NFS keep working on finding out the real culprit who killed Cha Joo Hee and made it look like an accidental death. They continue to follow the evidence and end up suspecting more than two people as suspects.
As soon as they thought they get some rest after solving a case, another murder occurs. The scene of the murder is rather clean, but the body is mutilated and burned. Both the NFS and prosecution rush over to collect evidence and figure out what happened.
As if one body wasn’t enough, they find a second victim. The body and the murder scene, however, are too similar to the first victim. The prosecution thinks this is a spree killing case and mobilizes the police to search and apprehend the culprit. Meanwhile, The NFS conducts autopsies on the two bodies.
Ji Han finds Hee Joo's tablet and starts investigating further. He, however, gets criticized for not being present at the crime scene with the newly discovered body parts. Meanwhile, the autopsy for the two victims take too long, and the result is inconclusive.
After extensive and meticulous autopsies, NFS finds something odd about the bodies. Although the victims look as if murdered, there are discrepancies that suggest something else. Beom runs more tests to make sure. Meanwhile, the prosecutors are assuming there are four victims and will be more murders.
Through Beom’s autopsy, he finds out there is only one murder instead of four. Moreover, from the body of the murdered victim, the NFS finds out the blood belongs to someone dead. Naturally, this discovery confuses the prosecution and the NFS.
The prosecution is still trying to locate the car was used when abducting Hee Joo. Meanwhile, the blood found inside Hee Joo’s body turns out to be Oh Man Sang’s and presumes he is alive and well. Thus, they connect the two and assumes the car they are chasing after is Man Sang’s and uses everything they have to chase him down.
Man Sang is still on the run and is now wanted. Meanwhile, Seo Hyun is having a birthday party and has invited Cheol. During the party, however, Seo Hyun gets kidnapped by someone. Now the police are doing everything to locate and rescue Seo Hyun.
The kidnapper has contacted Soo Yeon demanding 100,000 dollars as ransom. The police have put trackers on Soo Yeon and decide to follow her while she drops off the ransom. Suddenly, the kidnapper changes the location of the deal to lose the cops. While chasing after the kidnapper, an unfortunate accident causes problems for the team.
Cheol could not save the kidnapper, and now the NFS and prosecution have lost their only chance of finding Seo Hyun. Beom, however, wants to perform an autopsy to find out where Seo Hyun is. Even with a thorough autopsy, the clues don’t seem to add up to a definite answer.
The NFS and prosecution are able to narrow down the area. Even with this information, they don’t have enough time to search every building in the vicinity. Through blood analysis, the NFS finds out he worked at a chromium plating factory. Thus, the police start to search for the chromium factories in the area.
With the traces found by NFS, the prosecutors find out the chromium plating factory. They also find out that it is Jang Cheol who took Seo Hyun. Out of everyone’s surprise, Jang Cheol saves Seo Hyun and brings her back to Soo Yeon. Meanwhile, Han Sin and Dae Cheol want to stop Ji Han from investigating Oh Man Sang’s case.
Han Soo is a father with schizophrenia. Although he has been taken care by a social worker, his condition is worsening. One day, he gets into a fight with a driver on the road when he is selling corn and drinks with his son, Dong Woo. Meanwhile, prosecutors suspect that Han So is involved in a parricide case.
