In ancient times, there were two cities, Mu-Xi and Xuan-Yue, which had been at odds for generations and attempted to annex each other. The old Castellan of Mu-Xi City has no son under his knee, only his daughter Ye Zhaonan. The old Castellan was worried that Zhaonan would inherit the position of Castellan as a woman, fearing the possibility of clan usurpation. Constipation secretly concealed the daughter's gender, and he ordered Zhaonan to dress up as a man from a young age. In an accident, Ye Zhaonan fell into trouble and became a palace maid in Xuan-Yue Palace, suffering from various forms of bullying that she had never experienced before. However, her innate temperament as a Castellan in the deep palace was particularly unique, which was why she, along with the Xuan-Yue Castellan Liu Xuanming, A legendary story has been staged, 'One mountain cannot accommodate two tigers unless they are Castellans'.