Three years after the Jin Empire's second invasion of the Southern Song Dynasty, the former enemies Zhang Ru Meng and Nan Gong Cai Hong have spent twenty years living quietly in a distant desert, far from the world they once fought in. Their son Nan Gong Fei Yun is sixteen: gifted in both intellect and martial arts, naively ignorant of everything outside the desert. His parents send him to his uncle Du Gu Jian and aunt Yang Ying to find his place in the world. Fei Yun steps into a Song-Jin political conflict that rejects him from both sides due to his mixed heritage, accidentally rescues a mysterious girl named Ruo Xue who matches someone from his dreams, and pursues her across entangled martial world intrigues, deadly traps, sincere friendships, and the accumulated grievances of an era. The story unfolds as a comedy-tragedy of longing, loyalty, and tangled fate.