She pretended to be a princess and got married, just to sneak into Jiufang Palace to find the son of her predecessor, Xizuo; she planned and worked hard step by step, just to help him ascend the throne and achieve peace on the border between the two countries. But the palace walls are deep, and on one side are the temptations and favors of the current emperor; on the other side are the overt and covert schemes of the harem. The secret that has been sealed for a long time, the entanglement of the love between her children, where should she go?