Shen Zhaoning, the legitimate daughter of a distinguished military family, grew up in military camps and shed blood fighting for her country from an early age, only to be betrayed by her own loved ones. Her father, brother, and fiancé give the imperial red-tasseled tokens to her half-sister, steal her military achievements, and even intend to send her to the Northern Barbarians for a political marriage. They secretly plot to cripple her as well. With her heart completely broken, Shen Zhaoning signs a document severing all ties and leaves through the border pass to seek refuge with the Northern Barbarians. There, she wins the devotion of the Wolf King, Tuoba Xiao, and takes command of 300,000 iron cavalry. Facing her former loved ones at Yanmen Pass, she cuts all ties with the Shen family and her past love, beginning a brand-new life in the vast lands beyond the northern frontier.