From 1937 to 1945, in Shanghai and the theaters along the Yangtze River, the Japanese army accelerated the Yangtze River defense and poison gas warfare deployment, and the CCP was in urgent need of deciphering and counterattacking. Lin Jiujiu, who graduated from the Faculty of Law at Tokyo Imperial University, appears to be Japanese but is actually an underground member of the Chinese Communist Party. His father was a member of the Chinese Communist Party who was buried alive by the Japanese army. He lurked in the counter-espionage section of the Japanese Military Police, using the surveillance of the online section chief Sato as a cover. With his calmness, meticulousness and good disguise, he passed on intelligence and dealt with the crisis of identity exposure under the eyes of the Japanese army. After going through multiple tests such as the psychological game with Sato, Lao Zhou's identity reversal, and the entanglement of his mother's position, he finally shattered the Japanese Army's Plan G to burst the Yangtze River embankment and completed his latent mission.
