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By recreating the process of the Special Branch of the Communist Party of China under the leadership of the Communist Party of China that began to struggle in Shanghai in the 1920s, and the desperate battle with all forces on the hidden front, the film shows the irreplaceable contributions of those unsung heroes on the Party's secret front who are indispensable in the process of victory. After the outbreak of the all-out Anti-Japanese War, the Special Branch of the Communist Party of China under the leadership of the Communist Party of China circulated among Chongqing, Wang puppets, and Japanese spy agencies in Shanghai. Through the intricate intelligence system behind enemy lines, they instigated the enemy, obtained intelligence, killed traitors, and established a broader united front until the eve of the victory of the Anti-Japanese War...