In the "Mirror City" where memories can be read and tampered with, Ling Shuo, a top memory interrogator, makes a living by analyzing other people's memories, but he knows nothing about his own past. When he was ordered to investigate a bizarre "memory theft case" - the suspect Su Wan was accused of stealing a memory that did not exist at all, Ling Shuo discovered that deep in the memory of this mysterious female painter, the only key to his blank past was hidden. A dangerous journey to find the truth begins in a maze of lies and mirror images.