In his previous life, Shen Yanzhou, an archives specialist specializing in the history of espionage warfare in the Republic of China, accidentally passed his soul into the body of a military Shanghai station field agent with the same name. The original owner disappeared while tracing a confidential telegram, and he took over his body when he was about to die. Relying on the unique declassified files and historical timeline memories in his mind, Shen Yanzhou was forced to survive in the cracks of the concession: while disguising the identity of the original owner, dealing with suspicion and liquidation within the military command, while avoiding the pursuit of the Japanese special high school, Shen Yanzhou also secretly traced the truth about the original owner's disappearance and the whereabouts of the confidential telegram. With the core strategy of "taking advantage of the situation to break the situation", he traveled between the military command, Japanese special forces, concession patrol houses, underground party intelligence lines and overseas Chinese forces. Without a fixed team and being isolated and helpless, he gradually weaved a secret intelligence network. He had to fight against the calculations of all parties and face the risk of deviation of the historical trajectory. Every exchange of intelligence contained a life-or-death stake, and every decision he made rewrote the fate of the individual and his country.
