After the Xuanwu Gate Incident, Li Shimin (played by Tang Guoqiang), who ascended the throne, began the Zhenguan Reign. He appointed people according to their virtues and used them well, creating a group of outstanding political talents. However, people are not saints. Due to the neglect of disciplining their children, the crown prince Chengqian and Wei Wangtai were arrogant and extravagant, and the King of Jin hooked up with his favorite concubine Wu Meiniang (played by Qin Lan), causing Empress Changsun (played by Zhao Qian) to die in disappointment. Although Wu Wangke (played by Pan Yaowu) was favored by Li Shimin, he was killed by the ministers because his mother was the daughter of Emperor Yang of Sui. Princess Gaoyang (played by Shen Aojun) was loved by her father since she was a child, but when she reached the age of marriage, she fell in love with Wu Wangke and the monk Bianji of the Pure Land Temple, who were far away from the center of power, which made her father miserable. In the end, she was betrothed to Prime Minister Fang Xuanling as a daughter-in-law. Faced with her father using her as a bargaining chip for power trading, Princess Gaoyang hated it and felt ashamed. Finally, she broke through the shackles of feudal ethics and threw herself into the arms of her beloved Bian Ji...