After the victory of the Anti-Japanese War in 1945, Fang Mo, an underground member of the Communist Party of China, sneaked into the Shanghai Station of the Kuomintang Military Command and began his career as a lurker in a sea of spies and swords. He became the backbone of the telecommunications department by virtue of his extraordinary resourcefulness, but his repeated delivery of key information aroused the suspicion of Secret Service Chief Du Weiming.
When the civil war broke out, Fang Mo was transferred to the Nanjing Military Command Headquarters and worked tacitly with the new liaison officer Su Wen to steal combat secrets under layers of surveillance. Unexpectedly, he discovered that there was a "shadow" of an undercover military commander hidden in the top leadership of the CCP. The failure to rescue Su Wen puts him in danger, and factional fighting becomes his only respite. He cleverly borrows a knife to kill people, and finally brings the traitor Director Zhong to justice.
In 1948, the war situation reversed, and the withdrawal list of the military's "Phoenix Plan" became a must-have. Fang Mo fought back in Du Weiming's deadly trap and was promoted to director of the Confidential Office to master the core secrets, but also entered the most dangerous situation.
In the battle for the Yangtze River defense map in 1949, Fang Mo, whose identity was exposed, had a final showdown with the comeback Du Weiming on the banks of the Huangpu River. At the dawn of Shanghai's liberation, the mission of the lurkers has not ended. A new secret war has quietly begun before dawn.
