On the day when Su Yingying, the daughter of the loyal Chief Minister Su of the Cabinet, was married to the second prince Xie Yuheng, her family was massacred by Xie Yuheng and his troops on the grounds of the Chief Minister Su's alleged treason. Xie Yuheng thus ascended to the position of the crown prince. Three years later, Su Yingying returns to clear her father's name and uncover the truth behind the treason case. Teaming up with the seventh prince, Xie Yi'an, she disguises herself as Xie Yi'an's maid, Suying. Starting from the counterfeit banknote case, they discover its connection to Chief Minister Su and Xie Yuheng, prompting them to go deepe