Former criminal investigation consultant Shen Ao woke up in an abandoned factory, losing all his memory and carrying only half a metal plate engraved with special symbols. He found himself being hunted by unknown forces and possessing extraordinary criminal reasoning abilities. During his escape, he met Wei Chen, who claimed to be his assistant, and the two teamed up to investigate the mystery of his identity. As the investigation deepens, Shen Ao discovers that his amnesia is related to an unsolved serial murder case three years ago, and that he is both a key witness in the case and possibly the real murderer. Under double siege by the police and the "Gray Shadow", he must find the truth before recovering his memory, otherwise he will become a scapegoat.
