In the 1920s, the Chinese Communist Party begins its struggle in Shanghai, leading the covert front of the Chinese Communist Party's Special Branch, the Party strive in their deadly battle against various forces. The unsung heroes march towards victory through irreplaceable and inimitable courage and contributions.

After the War of Resistance Against Japan outbreak, the Chinese Communist Party's Special Branch in Shanghai circles between Chongqing, Wang Ching-Wei Government and Japanese espionage agencies. Through an intricate system of intelligence behind enemy lines, they recruit the enemy, obtain information, kill traitors, and establish a broader united front line, charging towards Yan 'an on the eve of the victory of the War of Resistance ...