In Haicheng in 2042, a revolutionary technology called "Conscious Echo" was born. It allows detectives to dive into the victim's world of fragmented memories called the "Spirit Realm" within 72 hours of his death. However, "Spiritual Realm" is not an objective video, but a maze of emotions, symbols and subconsciousness. Any slight logical fallacy may cause the infiltrator to lose consciousness and be trapped in the last dream of the deceased forever.
Cen Jie, the only member of the "Spirit Realm Detective Team" of the city police station, is also a skeptic of this technology. He is accustomed to cold physical evidence and rigorous logic, but he has to put on electrodes time and time again and sink into the bizarre echoes of other people's deaths.
This time, he wants to solve a secret room murder case. The deceased was Ling Shuang, the chief researcher of the "consciousness echo" technology. When Cen An sneaked into her "spiritual realm", she discovered that it was not the scientific research data and rational code as expected, but an abandoned amusement park covered by an eternal blizzard. The merry-go-round plays distorted nursery rhymes, and the Ferris wheel's cockpit is trapped with a crying reflection. The clue to the murderer is an ice butterfly condensed with tears that will never melt.
In the intersection of reality and virtual realm, Shen Shen not only has to hunt down the murderer in reality, but also fights against the monsters in the "spiritual realm" that are transformed from the fear of the dead. He gradually discovers that the truth of this murder has gone beyond a simple vendetta or love killing. Behind it involves the original sin from the birth of the "conscious echo" technology, and a shocking secret that can subvert mankind's definition of "existence".
