Pada awal debut mereka hanya 5 member yaitu; Kahi, Jung-Ah, Soyoung, Jooyeon, dan Bekah.
Debut pertama mereka membawakan single "AH" di Januati 2009, dan mereka mendapat cap/label sebagai Pussycat Dolls korea karena konsep yang matang dan sexy yang mereka gunakan.
Pada April 2009, After school merilis digital single dengan judul "DIVA" sekaligus memperkenalkan member baru mereka yaitu "U-ie"(Uee) . Kemudian pada oktober 2009 "Yoo-So Young" mengumumkan pengunduran dirinya dari After School karena alasan kesehatan dan studi. Pada Akhir bulan yang sama After School memperkenalkan 2 member baru yaitu "Raina: dan "Nana".
25 November 2009 mereka kembali dengan merilis Single Album kedua "Because of You". Pada 25 Maret 2010 After School merilis Single Album "BANG!" bersama dengan penambahan member baru "Lizzy" yang membuat After School Menjadi 8 member sepanjang tahun 2010.
Pada 29 April 2011 After School kembali dengan Full Album Pertama mereka "VIRGIN", angota baru yang sudah dikenalkan sejak akhir tahun 2010 yaitu "E-Young" juga debut dalam Album ini.
Jadi After School Sekarang memiliki 9 member.
Name : Park Kahi (박가희)
Real Name : Park Ji Young (박지영)
Position in Group : Leader, Vocalist, Rapper, Lyrics Composer & Co-Choreographer
Birth Date : 25th December 1980
Height : 168 cm
Weight : 50 kg
Blood Type : O
Star Sign : Capricorn
Award : Best Newcomer Award at SBS Entertainment Awards 2010
Twitter : @misskahi
Cyworld Mini Hompage : http://www.cyworld.com/kahipark
Me2Day : http://me2day.net/misskahi
Daum Fan Cafe : Dancer Kahi
Real Name : Kim Jung Ah (김정아)
Position in Group : Main Vocalist
Birth Date : 2nd August 1983
Height : 167 cm
Weight : 49 kg
Blood Type : O
Star Sign : Leo
Twitter : @AS_JungAh
Cyworld Mini Homepage : http://www.cyworld.com/jaloveja
Me2Day : http://me2day.net/83rlawjddk
Real Name : Lee Joo Yeon (이주연)
Position in Group : Sub Vocalist
Birth Date : 19th March 1987
Height : 168 cm
Weight : 45 kg
Blood Type : AB
Star Sign : Pisces
Twitter : @ASJuPal
Cyworld Mini Homepage : http://www.cyworld.com/juyeon319
Me2Day : http://me2day.net/wndus319
Daum Fan Cafe : zzangjueyoen
Name : U-ie (유이)
Real Name : Kim Yoo Jin (김유진)
Position in Group : Sub Vocalist
Birth Date : 9th April 1988
Height : 173 cm
Weight : 50 kg
Blood Type : AB
Star Sign : Aries
Award : Best Newcomer Award at MBC Entertainment Awards 2009
Twitter : @uuuei
Cyworld Mini Homepage : http://www.cyworld.com/dldkdbwls
Me2Day : http://me2day.net/dldkdbwls
Name : Raina (레이나)
Real Name : Oh Hye Rin (오혜린)
Position in Group : Main Vocalist
Birth Date :7th May 1989
Height : 166 cm
Weight : 46 kg
Blood Type : B
Star Sign : Taurus
Twitter : @raina57
Cyworld Mini Homepage : http://www.cyworld.com/AS_Raina
Me2Day : http://me2day.net/hyerin0507
Name : Nana (나나)
Real Name : Im Jin Ah (임진아)
Position in Group : Sub Vocalist
Birth Year : 14th September 1991
Height : 171 cm
Weight : 48 kg
Blood Type : A
Star Sign : Virgo
School : Jeongju Ochang High School
Me2Day : http://me2day.net/sanmiy7
Name : Lizzy (리지)
Real Name : Park Soo Young (박수영)
Position in Group : Sub Vocalist
Birth Date : 31st July 1992
Height : 168 cm
Weight : 46 kg
Blood Type : A
Star Sign : Leo
Hobbies : Enjoying Music, playing NDS games, Art & Crafts, Eating snacks
Specialty : Swimming, Piano
Favorite music : Dance Style, Ballad
Favorite singer : Lady Gaga, Beyonce, Park Jung-hyun
Favorite artist : Josh Hartnett, Kang Boo-ja
Twitter : @p_Lizzy
Cyworld Mini Hompage: http://www.cyworld.com/As_Lizzy
Me2Day : http://me2day.net/zaromi
Name: E-Young (이영)
Real Name: Noh Yiyoung (노이영)
Date of Birth: 16th August 1992
Hometown: Chuncheon
Star Sign: Leo
Height: 167cm
Weight: 45kg
Blood Type: A
Star Sign: Leo
Graduated Member
Name : Yoo So Young (유소영)
Real Name : Joo So Young (주소영)
Position in Group : Sub Vocalist
Birth Date : 29th March 1986
Height : 165 cm
Weight : 44 kg
Blood Type : AB
Star Sign : Aries
Cyworld Mini Homepage : http://www.cyworld.com/1004329
Daum Fan Cafe : HaPpyNess
• Graduated in October 2009 to pursue an acting career.
• Set to star in KBS1 daily drama “The Women of Our Home”.
Name : Bekah (베카)
Real Name : Rebekah Kim (레베카 김)
Position in Group : Sub Vocalist, Rapper
Birth Date : 11th August 1989
Height : 168 cm
Weight : 52 kg
Blood Type : AB
Star Sign : Leo
Twitter : @__BEKAH
Cyworld Mini Homepage : http://www.cyworld.com/bekahhh
Me2Day : http://me2day.net/AS-bek
• Graduated in July 2011 to study design.
