Late autumn of 1941, Shanghai. The "isolated island" occupied by the Japanese army was in turmoil, and all forces were intertwined. Shen Mo (pseudonym "Mo"), an underground member of the Communist Party of China, lurks in the secretariat of the Japanese and puppet Shanghai Municipal Government. On the surface, he is a translator who is proficient in Japanese, but in fact he is an intelligence agent codenamed "Hanren". His mission was to steal the core documents of the Japanese army's "Qingxiang" plan for the New Fourth Army base areas, code-named "Panshi".
