One day, a body is found on the street. The deceased is 'Jay'. He is an investigator from the future, just like Investigator K (Ha Seok-jin). There is only one clue related to his death, the 'Overworld (virtual world)'. Investigator K puts on 'Neuroconnect' and enters the virtual world. There, he discovers a path to another virtual world, and as he enters the virtual world within the virtual world, he witnesses a shocking scene.

A mysterious body found on the streets in the night. There is a large hole in the left side of his chest, and there is no blood, so the weapon is hard to determine. Investigator K, who was investigating the case, visited someone with a similar incident a few years ago. But Joe is reluctant to talk about the case at the time. What is the secret that the case is hiding?

The era of most of human decision -making in accordance with the judgment of super -intelligence. The crime rate is close to 0%. At this time a murder occurs. The culprit is Dosu. He has committed murder, but he doesn't know exactly why. Investigator K (Ha Seok -jin) doubts super intelligence ... What secret is hidden in this murder case?

In the artificial womb center, where thousands of fetuses are growing in groups, more than 200 artificial wombs are discarded due to mechanical malfunction. The incident collides with the forces opposing the artificial womb and the forces in favor of it, and the case flows out of control. At that time, 'L', the designer and deputy center director of the artificial womb system, is pointed out as the likely suspect... What is the truth of the case?

A fire breaks out in an art museum, and all of the works are burned down. These works were all made online and digitally using NFT technology. While the price of the NFT digital work is soaring, the art museum management technician Jun is caught as the culprit who caused the fire. Why did he set the museum on fire.?

Vera, an idol who is gaining popularity for her beautiful appearance and outstanding skills. Kills herself in the middle of the city. Case analyst K, who accidentally witnessed the scene, begins an investigation after receiving a report from his parents that the agency's representative killed Vera. Vera's parents and agency's representative, make conflicting claims. While investigating the case, case analyst K discovers Vera's secret, which they were all hiding

CGFC (cyborg martial arts), a martial arts group of athletes who mechanically strengthen their bodies, which is gaining more popularity than regular martial arts. There will be a match between the middleweight champion, Lee Wan, and ranking 5th, Mac, who challenge him. Mac, who suffered a KO defeat by Lee Wan, reports the death of Mac, who was taken to the hospital in a fainting state. Somewhere, Mac's death is doubtful. And a shocking secret that shakes the entire cyborg fighting machine is revealed...

An era when population control became stricter due to population growth. When babies are made only in virtual reality and can no longer be born in real life, a couple goes for a different try. Deciding to bring a virtual baby into reality. Biko, who was made in this way, is kidnapped a month after she came out into reality. Who did this for what reason?