Shine idols are going to be idols who can sing multiple attributes, like perhaps your voice is higher and you'd like to be a Cute and a Passion idol at the same time! Or maybe you sing lower like a lower passion idol and a cool idol, well in this you get to be both of the attributes! This role wont be specifically cast to anyone, it will be cast to multiple people.
The point of a shine idol is to-
1. have enough girls to sing 5 member songs,
2. turn in things when a main member is busy or sick
3. allow more people to be involved in our project