The princess, maid, prince, and knight easily formed this love triangle... At the engagement party between the much-anticipated princess Ling Yadie and the born prince Lei Haoming, the princess's sister Ling Qingchuan was afraid to see people like a maid, but she also had her knight there. Protecting her is Zhou Xi, who made a knighthood agreement with Qingchuan for three generations when he was young... The princess unfortunately sprained her foot the day before her performance. The maid turned around and turned into a princess to replace her sister in the performance. Little did she know the prince's love and the return of the knight...