On July 4, 2011, it was announced that After School would be divided into two AFTERSCHOOL RED and AFTERSCHOOL BLUE, as part of its return project. The Red unit is characterized as having a “sexy, strong and fierce” attitude, while the Blue unit is characterized by a “fresh, sweet and refreshing” concept. It was also revealed that fans who watched one of After School’s performances would have a chance to vote for which members they wanted for each unit. The formation of
AFTERSCHOOL BLUE unit was composed by Jooyeon, Raina, Lizzy and E-Young.
while the AFTERSCHOOL RED unit was composed by Kahi, JungAh, Nana and Uee;