Xiao Yi, an 18-year-old female high school student, died of a heart attack the night before the college entrance examination due to congenital heart disease. Her soul was found in the body of Liu Chunyu, the 15-year-old daughter of Liu Jingcheng, the right minister of the Qiyue Dynasty. In this way, Xiao Yi started her journey through time in this unfamiliar society with all the regrets from her previous life.