In the mid-1940s, there was an extremely brief special moment in Chinese history. After the victory in the Anti-Japanese War, the united front against Japan formed during the war between the Chinese Communist Party and the Kuomintang no longer existed. With the support of the United States, the Kuomintang forces launched a large-scale offensive against the liberated areas, while the army and people led by the Chinese Communist Party resolutely conducted defensive operations against the Kuomintang's military offensive... Faced with the serious situation of a full-scale civil war about to break out in China, U.S. President Truman adjusted his policy towards China and sent retired General Marshall, the former Chief of Staff of the Army, as a presidential envoy to China to mediate militarily, establishing a three-person military group and its leading military mediation executive department. At that time, personnel from the three parties of the U.S., KMT, and CCP wearing the blue three-ring insignia were active in various places, preventing military conflicts and establishing peace and democracy. The TV drama "Blue Three Rings" reflects the sharp struggles in this period in terms of the intricate military, political, and diplomatic aspects.