During the Anti-Japanese War, in order to successfully occupy Changsha, the Japanese army used the strategic agent "Black Butler" who had been lurking in China for 15 years to implement a long-planned strategic deception plan. Yun Muzhi, a member of the underground party of the Communist Party of China, was killed during the investigation of "Black Butler". Yun Hongshen (played by Cheng Yi), who does not know his father's true identity, returns to his hometown of Changsha in order to track down his father's murderer, and is immediately involved in a trap that has been laid by the "Black Butler". When he was confused and helpless, his father's lifetime friend Yang Ziming (played by He Zhonghua), a member of the underground party of the Communist Party of China, gave him great help and protection, and he finally saw through his opponent's scam.
