Xiao, Sima, Hua, and Xie are the four major families in the capital. Hua Mantian (played by Peter Ho) and Xie Qianxun (played by Zhang Xinyu) are childhood playmates. After they grow up, their friendship slowly turns into love. The two people who love each other regard each other as the destined person. Qingcheng (played by Li Xinai) is the emperor's favorite princess, and she is hopelessly in love with Hua Mantian. However, Qingcheng is destined to be sent to a foreign land for marriage, and Hua Mantian is the general who escorts the marriage team. Something happened in the Xie family. Hua Mantian was anxiously worried about Xie Qianxun's fate and prepared to secretly send her out of the city with the marriage team. Who knew that the accident still happened. Qingcheng and Xie Qianxun fell off the cliff at the same time. Fortunately, the two were treated by the mysterious female doctor Ling Guzi. Although they saved their lives, Qingcheng and Xie Qianxun exchanged faces.