Female forensic doctor Kong Qiqi traveled back in time to ancient times and became the adopted daughter of the prime minister's mansion in Beijing. After traveling back in time, Kong Qiqi lost some of her memories before traveling back in time. Kong Qiqi found that she could recover some of her memories every time she came into contact with a case, so Kong Qiqi started her journey of investigating cases. During the process, Kong Qiqi met Mu Zhixi, the ninth prince who was frail and dressed in white clothes. Mu Zhixi looked like her ex-boyfriend, and Mu Zhixi was attracted by Kong Qiqi's unique style of doing things. The two fell in love with each other. Kong Qiqi learned that Mu Zhixi was involved in a dispute over the throne 20 years ago, which caused her body to be poisoned and left with sequelae. With the help of Kong Qiqi, Mu Zhixi gradually unravelled the mystery of the case of the throne fight...