Su Lingxi, the legitimate imperial princess who grew up among ordinary people, suffers relentless framing by the adopted daughter of the Duke of Zhenguo's household. Treated cruelly and confined to a cold courtyard, she endures beatings and humiliation. The entire household even conspires against her, nearly sending her to the authorities to be executed. At her most desperate moment, the Crown Prince uses his secret guards to uncover her true royal bloodline and publicly acknowledges her as the princess who has been missing for many years. Casting aside her disguise of patience, Su Lingxi begins striking back at every turn. She exposes the mastermind, Yun Siyao, uncovers her treasonous conspiracy with the enemy, and brings her to justice. When enemy forces from the northern frontier threaten the kingdom, Su Lingxi travels alone to the border and, with just a few prophetic words, defeats the mighty Northern Qi army and ends the war without a battle.