- Qu Xiaofeng (Peng Xiaoran), the beloved princess of the Western Liang Kingdom, is promised to the Crown Prince of Li Dynasty in a political marriage between the two countries. Under the deliberate arrangement by Gu Jian (Shawn Wei), fifth prince Li Chengyin (Chen Xingxu) disguises as an ordinary tea merchant by the name Gu Xiaowu, and meets Qu Xiaofeng. They fell in love with each other as Li Chengyin tried to gain her trust to infiltrate Dan Chi, the kingdom ruled by Xiaofeng's grandfather, in order to gain war merits to become the new Crown Prince. After discovering the truth behind Li Chengyin's intentions, she jumps down the River of Forgetfulness to forget the painful memories. Li Chengyin, shocked at Xiaofeng's decision, follows suit.
Several months later, Xiaofeng is now married to Li Chengyin, who is now the crown prince of Li Kingdom. Although the Crown Prince is the second most powerful person in the kingdom, the Eastern Palace, where he lives, is one of the most dangerous places. Due to all the schemes and betrayals in the Eastern Palace, Xiaofeng and Chengyin's lives begin to intersect and somewhere buried within are hidden memories yet to resurface. Will Xiaofeng find true love during her journey and will she be able to face the cruel world of politics?