Three years ago, the Princess Ning'an, Qi Zhao, had her body taken over by a transmigrated woman, reduced to a laughingstock for trying to please the Heir of the Zhenbei Marquis, Xiao Yu. Three years later, Qi Zhao took back her body, publicly slapped Xiao Yu, and broke ties with him. She discovered that Xiao Yu and the Northern Di princess Ashina Yun considered themselves the heavenly mandated male and female leads in a script, conspiring in secret to subvert the Great Qi dynasty, while she and her younger brother, the Emperor Qi Ziyao, were destined to die miserably. To rewrite her destiny, Qi Zhao investigates the frontier army grain shortage case and exposes the Zhenbei Marquis Manor's treasonous evidence. Facing the palace gate coup orchestrated by Ashina Yun, the brother and sister join forces to break the deadlock, shatter the conspiracy, bring those involved to justice, and ultimately safeguard the country and break the so-called heavenly mandate.