What is the meaning of Korean lead dance and vice lead dance, home and vice lead singer, and what is the difference? Is there a hierarchy between leading dance and assistant leading dance?

The lead dancer will stand in front of the whole group and lead everyone to dance (most of the time), followed by the deputy lead dancer. The lead singer will share the most part of the whole song, and it is also a relatively rare or high-pitched part. The chorus is also the second kind, which is not as simple as the chorus, but more difficult than usual.