In the bustling modern metropolis, there lives a beautiful and intelligent white-collar lady Zhang Xiao (Liu Shishi). One day, she quarreled with her boyfriend and had an accident. This incident caused his soul to travel through hundreds of years to the Qing Dynasty, and his identity became a Manchu noble girl - Maertai Ruoxi. It was the 43rd year of Emperor Kangxi's reign, when the world was settled and the world was peaceful. However, under the prosperous appearance, undercurrents were surging and murderous intentions were everywhere. Emperor Kangxi (played by Liu Songren) had been strategizing all his life, and now faced the most important and dangerous choice, which was the choice of the next emperor. The fourth prince Yinzhen (played by Wu Qilong) was deep and introverted, and had a deep mansion; the fourteenth prince Yinzhen (played by Lin Gengxin) was loyal and ambitious; the eighth prince Yinsi (played by Zheng Jiaying) was gentle as jade, but he could not help himself. Ruoxi and a group of tender daughters were involved and witnessed the historical moment of nine princes competing for the throne... This film is adapted from Tong Hua's time-travel online novel of the same name.