Transmigrating into a doomed cannon-fodder princess in a novel who does not live past three chapters, Shen Heng is told by the system that to conquer the Northern Frontier's national preceptor, Xun Zhuo, failure means death. She takes the initiative to approach Xun Zhuo through a peace marriage, only to discover that he has long known her fate destiny is unusual. He bleeds into medicine for her, and she designs avalanche rescue tools for him. When Xun Zhuo's identity as an orphan of the Sacuan tribe is exposed and he faces encirclement and slaughter by seventeen tribes, Shen Heng breaks through the lines of fire and rushes into the cold chamber to feed him the antidote, saving his life. On their wedding night, their favorability reaches max value, and the system forcibly repatriates Shen Heng to the modern era. Xun Zhuo turns white-haired overnight, summoning souls with a near-death forbidden art. Shen Heng abandons everything in the modern world to return to the Northern Frontier. Ultimately, Xun Zhuo resolves the backlash of the Cold Abyss Art, and the two marry, raising a pair of dragon and phoenix twins, Shen Yan and Xun Ning, to guard the Northern Frontier together.