Su Jiuer, the daughter of a general, was repeatedly hunted down and assassinated by her stepmother because of her heroic figure and noble status. During one of her escapes, she accidentally met the Ninth Prince of the current dynasty. The two fell in love at first sight. The Ninth Prince married Su Jiuer into the palace regardless of the engagement. This behavior made the vicious stepmother and the original owner of the engagement, Su Yue, even more aggressive and designed to frame Su Jiuer. At the same time, the current queen pressed on step by step... An imperial decree and a substitute marriage seemed to be a match made in heaven, but can lovers be together?