Based on the novel "Legend of Condor Hero" by Jin Yong, the story is set in the middle of Song Dynasty and at the beginning of the Jurchen Invasion of China. Two dedicated Song Dynasty young men, Yang Tie Xin and Guo Xiao Tian find out that their wives are pregnant. They promise each other that when their children are born, they would become either sworn brothers or sworn sisters (if both are the same gender) or be married if they were of different genders. One night they befriend a Taoist priest named Qiu Chuji of Quan Zhen Sect who's wanted by Jin soldiers. Qiu Chuji dispatches soldiers coming to arrest him with ease and leaves when he sees a signal of his Sect appear in the night sky.