2011년 멤버 베카 탈퇴
2010년 멤버 이영 영입
2010년 멤버 리지 영입
2009년 멤버 나나, 레이나 영입
2009년 멤버 소영 탈퇴
2009년 멤버 유이 영입

2011년 제19회 대한민국문화연예대상 아이돌뮤직 최우수상
2011년 대한민국 대중문화예술상 문화부장관표창
2010년 제19회 하이원 서울가요대상 신인상
2010년 제1회 빌보드 재팬 뮤직어워즈 특별상
2009년 제34회 싸이월드 디지털 뮤직어워드 루키 오브 더 먼스

These energetic and sexy girls were originally dubbed Korea's version of the Pussy Cat Dolls. They were being touted for their powerful singing and dancing talents, not to mention their incredibly attractive looks even before their debut. One unique aspect of the group is that, like the name suggets, they run according to a "school" system. Basically, there's an admission and graduation concept where new members are added ("admitted), or withdrawn ("graduated") over time.

One thing to note, was that Kahi and Jung-a first performed along their labelmate of Pledis Entertainment, Son Dambi in 2008 before After School's debut.

Although this was enough to Along with the catchy tune of “Because of You", certain individual members started to make quite a name for themselves on the TV or acting front, which added to the overall recognition of After School. Arguably one of the most popular members of the group, Uee’s role on a popular reality show, “We Got Married,” along with her other drama projects, helped the team to stand out among other girl groups.

Some of the other members started to become more active in other realms as well. Lizzy started acting in a sitcom series, while the others started to become more and more regular faces on popular variety shows.

After School has branched outside of Korea to establish themselves as one of the more recognizeable groups abroad. They made their official debut in Japan in 2011 with the Japanese versions of their hit songs like "Bang!", "Diva", and "Because Of You". They even made their way onto the Oricon Weekly music charts within the top ten.

Successful sub-unit groups were created from After School as well.
Most notably Orange Caramel consisting of Raina, Nana, and Lizzy. This group had a completely different image from any girl group out there, with a bright, sugar-sweet concept.

After School Blue and After School Red were also created, splitting up the group into half with slightly different concepts.