In 1940, behind enemy lines in North China, the Japanese army implemented the "cage policy" to sweep away the haze that enveloped the land. {Shen Yan} lurks in the Japanese Intelligence Office as a military telegraph operator. With his "Morse Code Shorthand" golden finger, he can decipher the Japanese secret messages in an instant.
He pretended to be obedient, but intercepted the Japanese raiding plan on the radio waves, and secretly communicated with the underground party liaison officer {Su Qingyuan} disguised as a typist. Coded signals were passed on the streets, telegraph machines were hidden in cracks in the walls, and intelligence was destroyed in emergencies. The two were repeatedly involved in danger under the close supervision of Kenichi Matsui.
From deciphering secret messages to delivering intelligence, from resolving identity tests to assisting the Eighth Route Army in setting up ambushes, Shen Yan used his fingertips as blades to tear open gaps in the whirlpool of espionage, used intelligence to protect his homeland, and continued to write the blood of resistance in desperate situations.
