In a future city where memories can be bought and sold, Lin Chuan, an elite memory tracer, received an impossible task: to find a memory that "never happened". The client is a mysterious woman who firmly believes that she has spent a non-existent time with someone. As the investigation deepened, Lin Chuan discovered that this was not a simple delusion, but involved a conspiracy that could subvert reality, and his own memory seemed to be a carefully woven lie.