Yan Xu, the boyfriend of the heroine Xin Ci, sacrificed his life for a righteous cause. Before his death, he struggled to call his girlfriend Xin Ci to explain why he was late for the date he agreed to meet his parents. However, the hot-tempered Xin Ci scolded her with fierce words. With regret, Yan Xu passed away. After learning about it, Xin Ci was filled with grief. With the shadow in his heart, Xin Ci transformed himself from the age of a flower to a 29-year-old "leftover girl". Ten years later, Xin Ci went to climb Mount Tai with the old wish of Yan Xu, but lost his way and accidentally traveled through time. Unexpectedly, the gate of time and space brought her to an imaginary dynasty, and her age also shrank significantly, shrinking to a seventeen-year-old girl. Due to the compression of time and space, Xin Ci also lost his memory. When Xin Ci fell, he was rescued by Mu Wuyang, a woman who looked exactly like him. At this time, Mu Wuyang was being forced to marry by the second prince, who had always had a bad reputation in the court. Mu Wuyang's father proposed that when Li Daitao was dead, Xin Ci, who had lost his memory, believed the Mu family's father and daughter's words. It happened that the second prince had the same appearance as Yan Xu. Unexpectedly, a small incident unveiled the scam. Xin Ci, who had been mistreated, suddenly recalled the past, struggled to leave, went to a new city, and started a new life. However, fate played a trick. Five years later, the old friends met again, and Xin Ci was once again forced to be involved in the past and the power disputes of this dynasty. Who is true love and who is the right son? I want to know you, do you know my heart?