Song Xinyue, the legitimate daughter of the Marquis of Zhenbei's mansion, is reborn on the day of her wedding. In her past life, her concubine-born elder sister Song Chuyue took her place in marriage, resulting in a tragic death. In this life, she sees through the vicious plot, exposes the marriage-swapping conspiracy right in the wedding hall, and remarries Chi Feng, the First Prince guarding the northern borders. Trusting and supporting each other, Song Xinyue step by step breaks free from the shackles of fate, getting embroiled in court disputes along with her husband. She rules the country in times of crisis and establishes a school for women of humble origins; Chi Feng fights campaigns to protect and pacify the country. The enemies of her past life receive their retribution one by one, and Song Xinyue harvests sincere love and children, breaking the predicament of feudal women and living out a new, fulfilling life.