The Xiao family used to be the imperial prison of the former dynasty, but they were exterminated because they figured out that the Emperor Star had changed owners. The young Xiao Qingyuan was rescued by Gu Hanmu, the regent of the new dynasty. Gu Hanmu trained her into the sharpest dark blade and used secret medicine to control her. He regarded her as a tool to control the courtiers and a chess piece that could be discarded at any time.
The word "Qingyuan" is not only her name, but also Gu Hanmu's definition of her - a paper kite that flies high, but the thread is still in his hand.
