In the late 1930s, in the turbulent Shanghai, Chinese underground intelligence agent Chen Xinghe became a mortal enemy of Japanese intelligence chief Seiichi Yamaguchi due to an accidental mission. Traitors betray the country, traitors lurk, friendship and betrayal, black and white and gray shadows are intertwined. Chen Xinghe and his partner Zhang Ergou dealt with various forces, saved the day from danger many times, and gradually grew into China's ace intelligence agents. He and the female section chief Su Manman developed a secret love while fighting side by side, and they broke the situation and averted danger in the humorous gags. The situation suddenly changed, and life and death hung on the line. In the end, everyone sacrificed themselves and saved the country first. In the final decisive battle, the Japanese counterintelligence leader was brought to justice, and they also completed their own redemption.
