After School

After School, stylized as AFTERSCHOOL in Japan, was a South Korean girl group formed by Pledis Entertainment with an admissions and graduation concept. As of September 2018, After School has had eleven members who have joined and "graduated" since their debut as a quintet in 2009. After School officially debuted in January 2009 with "AH!" from the single album New Schoolgirl. Following the addition of Uee in April of that year, they released "Diva", which won the "Rookie of the Month" award at the Cyworld Digital Music Awards. Pledis Entertainment then announced the graduation of Soyoung, before adding Raina and Nana for the release of "Because of You" in November 2009, which was an instant hit and became a commercial and critical success for the group, with the song winning a "triple crown" on SBS Inkigayo and was the best selling song of December 2009, eventually becoming one of the best selling K-Pop singles of all time.