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, an underground party member, was killed during the investigation of Black Butler.Yun Hongshen, who doesn't 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 set by Black Butler.When he was confused and helpless, his father's lifelong friend and underground party member Yang Ziming gave him great help and protection, and he finally saw through his opponent's scam.Under the leadership of the Communist Party, Yun Hongshen joined forces with the patriotic young man Wen Yeming, setting up a game within the game, step by step, putting aside his family feud in the face of national hatred, setting himself up as a dead chess piece, and digging out the secrets hidden deep inside the national army.The latent Japanese strategic agents turned the tide of the war and made a great contribution to the victory of the first Battle of Changsha.