In the "Mirror City" where memories can be retrieved and played back, Lu Chuan, a former elite law enforcement officer, became a private detective due to a fatal mistake, living with the nightmare of his past all day long. A mysterious disappearance dragged him back into the center of the whirlpool: the daughter of a technology giant, a "memory painter" disappeared mysteriously. As the investigation deepened, Lu Chuan discovered that the clues to the case actually pointed to the "Scarlet Echo" incident that ruined his reputation. He must once again face the memory reading technology that killed him. In the intertwined memory fragments of true and false, he must not only pursue the truth, but also find salvation for his long-lost soul. In the Mirror City, everyone's memory is a maze, and the echoes of crime and punishment never stop.