Su Qingyue took her sister's place in marriage to the disabled heir Xiao Yanci, only to face a raided home and exile on their wedding day. Relying on provisions planned in advance, her family's medical skills, and extraordinary wisdom, she shared weal and woe with the heir, reclaiming wasteland, practicing medicine to save people, and building a home in the bitter cold of the northern frontier. Together, the two investigated old injustices and guarded border peace, finally clearing their names and turning the desolate land into a peaceful pastoral paradise for the people north of the frontier.