Information came mostly from wiki and some from allkpop.
Group Active : 2008 - Present
Official Website : http://www.a-school.co.kr/
Park Kahi (Kahi) -Leader
Kim Jung Ah (Jung-A)
Kim Jung Ah (Juyeon)
Kim Yoo Jin (UEE/U-IE) - Joined April 2009
Oh Hye Rin (Raina) - Joined November 2009
Im Jin Ah (Nana) - Joined November 2009
Park Soo Young (Lizzy) - Joined March 2010
Noh Lee Young (E-Young) - Joined December 2010
Former Members :
Yoo So Young (So Young) - Left October 2009
Rebekah Kim (Beka) - Left June 2011
Background of After School:
After School trained for two years before debuting in December of 2008. But they wouldn't be releasing their first extended single until January of 2009. Modeled after the Pussycat Dolls, their member rotation and subgroups are more similar to that of Morning Musume. The group started with five members, Ga Hee, Jung Ah, Joo Yeon, Bekah, and So Young. They had a rocky debut and their corepgraphy for AH and Play Girlz were deemed too sexy, and Bad Guy never got promoted because of a single word of profanity in the lyrics. Despite the setbacks they were awarded an endorsment deal with Adidas and a reality show on MTV titled Diary of After School.
In April of 2009 a 6th member joined the group, UEE and with that a drastic image change to appeal more to the masses. DIVA was released as a digital single that same month. Conicidently they performed in the Pussycat Dolls premier concert in Seoul as well as released a remake of Love Machine by Morning Musume titled Dream Girl in May of 2009 for the Hello!Project Korea auditions.
In October of 2009, So Young graduated from After School to persue an acting career. In November, two new members, Raina and Nana joined the group and After School would then release their second extended single, Neo Ttaemune. Despite being leaked early on the radio, the single reached #1 on the online charts. They won their first Mutizen award on SBS Inkigayo in December of 2009 and won the Best Style Icon award at the 2009 Korean Lifestyle Awards.
After an extended break, in March of 2010 After School returned with their 3rd extended single with a new image and a new member, Lizzy, the youngest member of the group. Bang! was originally supposed to appear in the 2nd single but was pushed as the title track of the third. The girls practiced the drums for five months in preperation for this release. Kahi is credited for the singles marching band concept.
In July 2010, After School's company Pledis Entertainment held a new audition for a 9th member to join the group and in December of 2010, Lee Young made her first public apperance with the group during a performance of Bang! where she had a electric guitar solo. She wouldn't start group activies though till April of 2011 when AFTERSCHOOL minus Bekah would make their Japanese debut in a music video collab with Namie Amuro with, make it happen. Lee Young made her official debut with the group in Korea with their first album, VIRGIN and once again Bekah was not able to promote fully along with the group due to an injury, though she was in the live performances of Shampoo. It was later revealed that Bekah would be leaving the group in June 2011 to return to Hawaii and pursue a career in fashion design. The album, VIRGIN also featured an unknown singer credited as "Pre-School Girl Yun Jo", who is presumably a Pledis Entertainment trainee, but not much else is known about her. Though some speculate she may become a future member of After School.
Subgroups, Soloists and Happy Pledis Oh My!:
In May of 2010; Nana, Raina, and Lizzy were chosen to form Orange Caramel, a group similar to those idol groups found in Japan. In December of 2010, After School released their 4th physical single, Hazel Eyes under the group name, Happy Pledis. Hazel Eyes is the first part of a special charity single series released by Pledis Entertainment. Bekah did not take part in the release. Kahi would make her solo debut in Febuary of 2011 with Dorawa Nappeun Neo.
In July of 2011, Pledis revealed that for the summer the group would be broke up into two groups of 4. One sexy group, AS Red and the other a cute group, AS Blue. The members of the group would be voted on by the fans. Stay tuned for more info~
After School Discography
VIRGIN : 04.27.11
Promoted Songs : SHAMPOO (MV)
New Schoolgirl: 01.15.09
Promoted Songs : AH (MV), Playgirlz + AH (Live)
Because of You (너 때문에): 11.25.09
Promoted Songs : Neo Ttaemune (MV), DIVA (Live)
Promoted Songs : Let's Do it (MV) , Bang! (MV)
Hazel Eyes : 12.07.10 (As Happy Pledis)
Promoted Songs : Love Love Love (MV) / Love Love Love V.2 (MV)
DIVA: 04.09.09 MV
Dream Girl: 05.22.09 MV
Because of You [Neo Ttaemune] (Remix): [01.22.10] LIVE
Olympic Duet Song Festival (Spring Chicken Soup (영계백숙) (Jung Joon Ha feat. After School): 07.13.09
AMOLED (Son Dam Bi & After School): 07.23.09 MV
You (Hurt (아프죠)) (Sunny Side feat. After School): 08.06.09 MV
Tempted Again OST (Half (반쪽)) (After School feat. Sunny Side): 08.31.09 Err...MV?
The Shouts Of Reds. United Korea (Repackage) (Dreams Again!): 05.18.10 MV
Amuro Namie - Checkmate! (make it happen (Amuro Namie feat. AFTERSCHOOL)): 04.17.11 MV
Members: Nana, Raina, Lizzy
Active : 2010 - Present
The First Mini Album (The Taiwanese version of this album contained a Chinese cover of M2M's "The Day You Went Away."): 06.17.10
Promoted Songs: Mabeop Sonyeo (Magic Girl) (MV)
The Second Mini Album : 11.18.10
Promoted Songs: Aing♡ (MV)
Bangkok City: 04.20.11 (Digital Single Released on 03.31.11) (MV)
Members: Jooyeon, Raina, Lizzy, and E-Young
Member: Kahi, Jungah, Nana, and UEE
Dorawa Nappeun Neo (돌아와 나쁜 너; Come Back, Bad You) : 02.14.11 (MV)
Son Dam Bi - Mini Album Vol.1 (Son Dam Bi) (#2 Bad Boy) : 04.29.08 (MV)
Let's go! : 10.15.10 (Korean MV/ English MV)