Make your own KPOP-group with Ex-Idols

I mean only idols who doesn't contribute anymore in the music industry.

Example:

Jiyoung(Kara) - Main vocals
Bekah(After School) - Lead Rapper
HwaYoung(T-ara) - main Rapper
SunYe(Wonder Girls) - Lead vocals (Leader)
Lee Sem (Nine Muses) - Vocals / rapper