On the day she married the second prince Xie Yu Heng, Su Ying Ying, the daughter of the Su family, the chief assistant of the loyal cabinet, was led by Xie Yu Heng to kill the whole family on the grounds that the chief assistant of Su was collaborating with the enemy and treason. Xie Yu Heng also became the crown prince. position. Three years later, Su Ying Ying returned with the intention of clearing her father's wrongdoing and investigating the case of collaborating with the enemy and treason. She joined forces with the seventh prince Xie Yi An and disguised herself as Xie Yi An's maid Su Ying. The two started with the counterfeit banknote case and found that the case was related to Su Shoufu and Xie Yu Heng, so they investigated in depth. The two also went from being at odds with each other at the beginning. They worked together and approached the people involved in the counterfeit banknote case regardless of the danger. They got closer to the truth step by step, and thus exposed Xie Yu Heng's conspiracy to seek power and usurp the throne. It turned out that Xie Yu Heng was not In order to fight for the royal power, he manufactured counterfeit banknotes to amass wealth, bribed officials and cultivated a killer organization "Suzaku Pavilion" to eradicate dissidents. Because Su Shoufu found out that Xie Yuheng was the mastermind of the counterfeit banknote case before his death, Xie Yu Heng ordered his life Stealing Su's official seal and forging documents indicating that Su was collaborating with the enemy to frame Su. (Source: Gmat6594 Gmat6594 at Dramacool)