An ancient girl from the Earth travels through the Yao Dynasty and evolves simultaneously with the Earth's civilization, but she only respects "ritual and music", and the rhythm of music is the law.
The music is divided into nine levels, the first level "Jun Tian" is the supreme song, and the ninth level "Zheliu" is the common ballad.
Anyone who makes "forbidden sounds" will be exiled to the "silent abyss" - unable to speak for eternity.
