In the mid-1940s, there was an extremely short and special moment in Chinese history.After the victory of the Anti-Japanese War, the anti-Japanese national united front formed by the Communist Party of China and the Kuomintang during the war no longer existed.With the support of the United States, the Kuomintang army launched a large-scale attack on the liberated areas. The army and people under the leadership of the Communist Party of China resolutely carried out self-defense operations against the Kuomintang's military offensive... Faced with the serious situation of the upcoming outbreak of China's comprehensive civil war, US President Truman adjusted his policy toward China and sent retired former Chief of Staff General Marshall as the president's special envoy to China for military mediation, and established a military three-person group and its military mediation and executive department under its leadership.For a time, the Communist Party and the United States, which wore the blue Three Rings logo, were active in various places, to stop military conflicts and establish peaceful democracy.The TV series "Blue Three Rings" reflects the complex and sharp struggles in military, political and diplomatic aspects of this period.