In Shanghai in 1943, ace agent Shen Yanqing was betrayed and drowned, but he was reborn with his memories before the mission failed. He serves as an undercover military commander and a secret chess player of the underground party. He deals with No. 76 Demon Cave and the Japanese spy network, using the knife of revenge to dissect the shady secrets of the spy network. Where is the traitor hiding? Is rebirth a turning point or a conspiracy? Bloody revenge collides with the counterintelligence puzzle, and faith and life are at stake at every step.