Ten years ago, a fire in the basement of Huanyu Building burned down the abandoned laboratory and also buried traces of Jiang Chen, a top student in the Department of Chemistry. The fire report was full of holes, the disappearance case was hastily closed, and only a strange invitation with a Möbius strip hinted that the truth was not yet dead.
Ten years later, Lin Xia, who was determined to track down the truth behind the disappearance, accidentally discovered the deliberately protected "fire scene" - the laboratory was intact, with no scorch marks on the walls, and an experimental record from 2016 hiding a fatal secret. Teaming up with school guard undercover Chen Mo and technical expert Lu Ze, they not only encountered a mysterious shadow in the ventilation duct, but also uncovered a shocking scam: the fire was an illusion, and behind the Mobius project was a heinous illegal human experiment.
The USB disk that the maintenance worker Lao Zhou has been guarding for ten years, the suspicion of the deceased Li Ming's fall, and the strange whereabouts of Professor Zhao lead the clues to a deeper whirlpool. When the cold wind in the escape tunnel carried the warning to "be careful of those around you", and when the explosion in the Huanyu Building illuminated the night sky, they discovered that there were not only those behind the scenes who coveted the core technology, but also third-party forces hidden in the dark.
The secrets on the top floor of the Huanyu Building, the Mobius mark in the clock tower, and the suspicious light in the eyes of the people around him are intertwined into a death cycle that spans ten years. Are they pursuing the truth, or have they already entered an unsolvable puzzle set by the murderer? Every step closer to the answer is accompanied by fatal danger. At the other end of the Möbius strip, is there salvation or a more terrifying abyss?
