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In 1929, the war between Chiang Kai-shek and Guangxi clique broke out, with warlord forces dividing the country. Communist Party member Tan Wenyong, tasked with the mission of winning over the armed forces of the Guangxi clique, arrived in Nanning. His target was his sworn brother Zhang Yunlin, while his sworn brother Man Haizi, due to a misunderstanding, defected to Chiang Kai-shek. The three brothers, differing in stance and beliefs, engaged in a struggle. Under the call of revolution, Zhang Yunlin rose up in arms and ultimately sacrificed his life for the revolution, dying on the battlefield. Man Haizi, after experiencing various conflicts and contradictions, learned the truth and also died on the battlefield. Tan Wenyong's beloved Lin Yao, after undergoing numerous trials, followed Tan Wenyong and joined the Communist Party.