This film is about the eve of the outbreak of the Songhu Battle on August 13, 1937. A special elite group was sent to Jiangcheng, a military fortress, to inquire about intelligence. The devils pretended to be soldiers of the national army, but they were eventually exposed by Zhao Jingzhou, a member of the Communist Party. Zhao Jingzhou's childhood friend Jiang Fengting was also among them. The Japanese Jiang Fengting, whose parents died when he was young, was brought up by the Chinese student Jiang Wanlin. Later, his uncle took him back to Japan, and Jiang Wanlin's daughter Jiang Mei and Zhao Jingzhou were childhood sweethearts. What I thought of was that Jiang Fengting would be kind and kill him back to Jiangcheng, but his real identity turned out to be a cold-blooded killer. The two childhood friends started a battle of wits and courage, and finally Zhao Jingzhou killed all the Japanese devils and drove them out of Jiangcheng. During the war, the love relationship between Zhao Jingzhou and Jiang Mei was under a lot of pressure. Zhao Jingzhou's teacher Qi Mantang forced him to marry his daughter Qi Ruhua, so Zhao Jingzhou was in a dilemma between the two women. After many hardships and misunderstandings, they came together Some touching and pure deeds have happened..