Xu Xiao has risen to become King of Northern Liang at a time of great upheaval in China. Steppe kingdoms have risen with deadly intent, and rebellious uprisings threaten to destabilise the realm in the south. Xu Xiao has managed to defeat them all. His unconventional, free-spirited son and heir Xu Feng Nian has spent years on the road, honing his horse skills and fighting prowess. Along the way, he meets the double sword-wielding martial arts expert Nan Gong Pu She, who becomes his confidante.