The heroine Yin Mengyi, who has a brother-in-love plot, disguises herself as a eunuch and goes to the palace to look for her brother. She meets Nan Fengyuan Shengjia, the glorious county official with vicious tastes, and the national preceptor Long Yuye who wears a mask and can never leave the pagoda. What kind of secrets does Xiangyouguo have?