The film tells the story of the first generation of leaders of the Communist Party of China, represented by Mao Zedong, who convened the First National Congress of the Communist Party of China, established the Communist Party of China, and led the Communist Party to explore and mature at a time of national crisis. The story is based on the perspective of the "First National Congress" led by Mao Zedong, starting from the main contradictions in Chinese society after 1919, and based on the development of the Party. It shows that the revolutionary predecessors, through arduous struggles, opened up an unprecedented revolutionary path and finally achieved great victory when the Party was facing a critical moment and the nation was in danger.