On the eve of the liberation of New China, Xu Tian, a young policeman at Baizhifang Police Station, accidentally participated in the cause of the Chinese Communist Party's peaceful liberation of Peking while investigating the murder of his fiancée Jia Xiaoduo. Faced with the turbulent times, the three brothers Jin Hai, Tie Lin and Xu Tian were in different positions. When family affection, love, national interests and personal beliefs conflicted fiercely, the three brothers made different choices and embarked on completely different life paths. Xu Tian and Communist Party member Tian Dan met in despair, and a sense of mission brought the two together. Xu Tian chose to assist the Chinese Communist Party in the turmoil to achieve the peaceful liberation of Peking and usher in a new world.