Who is After School? After School is a South Korean girl group formed by Pledis Entertainment in 2009.
Debuting initially in January 2009 as a 5-member group with "AH", they were labeled the Korean Pussycat Dolls for their mature and sexy concept. Later in April 2009, After School released their first digital single "Diva" and introduced their newest member, U-ie, following their admission/graduation concept. Then, in November 2009, original member Yoo Soyoung departed from the group citing health and study reasons. At the end of the same month, After School admitted two new members, Raina and Nana, into the group for their 2nd single "Because of You".