This line comes from "A Beautiful Girl Is Like a Dream", sung by Huo Zun,
composed by the well-known musician A Kun, and written by He Qiling. It is part of Huaer Film and Television's annual drama "The Legend of Mi Yue" 's theme song.
It means that no matter how the years change, I will still wait for you as always, dance in the world for you, and never change my original intention for you.