After Li Shuang is betrayed by the crown prince, she realizes that their once-sincere vows of eternal love can never outweigh the lure of power. So she decides to head for the desolate, challenging lands beyond the northern frontier.
What she never expected was that Qin Lan, who had been by her side since their youth and throughout more than a decade in the army, had secretly fallen in love with her. He acts as her captain of the guards, but behind the scenes, he uses every means at his disposal to get rid of the men around her.