There are at least 2 acts called After School: -
1) After School was a South Korean girl group formed by Pledis Entertainment in 2009. They were the first group to debut with a unique admissions and graduation concept in Korea, where members were added or withdrawn in a “natural” manner. All former members: Raina, Nana and E-Young.
Soyoung withdrew from the group in fall 2009, Bekah officially graduated from the group in July 2011, former leader Kahi graduated in September 2012 .
