{Shen Mo} disguised himself as a Japanese translator and lurked in the headquarters, codenamed "Nightingale". The pen in his hand hid a secret - the pen held a microfilm, and the pen tip hid an anesthetic needle. The Japanese army is brewing a plan to raid North China, and he needs to steal core intelligence under the eyes of the suspicious intelligence section chief {Ichiro Sato}.
The underground party liaison officer {Su Wan} transformed into a hawker and teacher, and used secret codes to communicate with him in teahouses and markets, and narrowly escaped investigation by the Japanese army several times. From late-night secret theft in the headquarters archives to the life-and-death speed of delivering information in heavy rain, Shen Mo was on the verge of exposing his identity, while Su Wan was building a safe passage in the dark.
Using their pens as their blades and their faith as their shield, they eventually passed on the raiding plan to the Eighth Route Army, helped set up an ambush and smashed the Japanese conspiracy, and guarded the land of North China with their blood.
