In the first year of the Sheng Dynasty, Ciyue was born, and snowdrops bloomed across the southern border overnight. Millions revered her as an auspicious sign, and the emperor bestowed a surname, creating her a county princess. Yet why could this auspicious sign not protect her mother or keep her father's military power? At eighteen, a tattered bronze token drags out old secrets, and with every step she draws closer, someone dies mysteriously. At the end of the clues hides the Dingshan Project pushed by the mad emperor of the previous dynasty. Was he truly a mad emperor? Su Ciyue, Shangguan Ciyue, if names are all masks, who on earth is she? Among those by her side, who can be trusted?