The protagonist Liu Yuan travels through time and space and lands directly in Zhang Fei's peach garden in Zhuo County at the end of the Eastern Han Dynasty, just when Liu Bei, Guan Yu, and Zhang Fei are preparing to form an alliance. Considered by Liu Guanzhang as a "stranger from heaven", after the protagonist showed extraordinary insight and a certain degree of courage, he was invited to join him in sworn friendship, ranking fourth. Use foresight and brotherhood to assist his eldest brother Liu Bei, change the fate of Shu Han, and finally achieve unification of the world and avoid tragedy.
