It is a story that takes place in the palace. The emperor's lover followed his brother, and then met Xiaoxi who had descended to earth. Because he looked similar, he took him into the palace, and a series of things happened.
Xiao Xi loved the emperor, so she let him go and tolerated him everywhere. Later, the real master came back and the god who loved Xiao Xi appeared, etc. In short, you will know after reading it.
A typical stand-in, my favorite.