In the late 1930s, the famous Peking Opera troupe "Shengjiaban" in North China had a grudge with the bandit Jiang Youcai. In the conflict, the father and mentor of the top martial artist Sheng Zhonghao died tragically. Before his death, his father forced Sheng Zhonghao to swear that he would not take revenge. Sheng reluctantly took his junior brother Wen Lixuan and junior sister Zhen Yuhuan to Tianjin. On the way, several people were dispersed by the defeated soldiers. In order to cover his fellow student Sheng Zhonghao, he was arrested and fell into the Japanese labor camp. In the process, Sheng Zhonghao killed the traitor to avenge his uncle, and therefore missed the opportunity to reunite with his junior sister Zhen Yuhuan. The deeply in love pair of fellow students have been separated from each other since then. Many years later, the three brothers and sisters met on the battlefield, with mixed feelings. Sheng Zhonghao finally integrated into the revolutionary torrent, and the Longjiaji Anti-Japanese Self-Defense Army was officially reorganized into the Eighth Route Army Independent Battalion. Sheng Zhonghao served as the battalion commander and Wen Lixuan as the instructor. The two brothers fought side by side again, and finally they wiped out the entire Wu Tengxiong unit.