Bai Yu was adopted by the Bai family about ten years ago. Because of his natural endowments, he can play the zither very well, so he was left in the palace to be educated and became the youngest court musician in the palace. About four years ago, then the sky was in chaos, Bai Yu was summoned to collect and restore the lost musical score of Qionglin. He's the former protector of the third princess.