Lin Yu is a Class B field agent of the Special Investigation Bureau, specializing in handling myth echo incidents. He had been smelling rot lately, and when he looked in the mirror, he noticed plaques on his left arm - those were cadaveric plaques. His colleagues comforted him that he was too tired. Only he knew that his heartbeat had stopped after the accident six months ago. In order to avoid being sent to the incinerator, he must pretend to be normal. However, a new case came: the commuter subway disappeared overnight, and three hundred passengers lost their collective memory. No one could remember what happened in those few hours. Monitoring showed that the train entered and exited the station normally, but there was a gap in the timeline that no one knew about. The living detectives were helpless, but Lin Yu saw something different - his detective panel automatically activated and marked the "folds of time" wrapped around the witnesses. Touching the folds, he saw the image of the deceased's obsession: a man wearing a mask saying the same sentence repeatedly. Every time he touched it, a piece of his finger rotted away. Qin Zhaoning, an old teammate of the national team, noticed his anomaly, and Gongsun Mo privately warned him not to do anything wrong. But they soon discovered that only Lin Yu could enter that forgotten timeline. As the truth approached, Lin Yu realized with horror that the source of collective amnesia might be hidden in his own rotten brain tissue. Is he a detective, or is he the murderer that everyone has forgotten?
