On the day Su Yingying, the daughter of Mr. Su, the chief assistant of the loyal cabinet, married the second prince Xie Yuheng, Xie Yuheng led his troops to kill the whole family because Mr. Su had collaborated with the enemy and treason. Xie Yuheng also ascended to the position of crown prince. Three years later, Su Yingying returned intending to redress her father's injustice and investigate the case of collaborating with the enemy and treason. She joined forces with the seventh prince Xie Yi'an and disguised herself as Su Ying, Xie Yi'an's maid.