Why is Da Qin Fu 17 only scored by Lao Ai?

The plot plays a secondary role in the whole story and has no direct relationship with the main plot, so it doesn't go too far. Lao Ai, formerly known as Ge Yi, was a famous wizard and physician during the Spring and Autumn Period and the Warring States Period in Chinese history. It is said that he has the magical ability to predict the future and ascend to heaven. In Dafuqin, Lao Ai was portrayed as an eccentric and insidious figure who provided prophecy and divination services for monarchs of various countries, and was finally killed by Qin Shihuang.