[2] Pledis Entertainment then announced the graduation of Soyoung before adding Raina and Nana for the release of "Because of You", which topped the monthly digital chart for December 2009.

[11] From 2015 onward, Pledis halted both After School and Orange Caramel promotions and the members have embarked on individual music, acting and modeling careers.

In the start of 2009, a few days before After School's debut, Pledis Entertainment announced that the group's music concept was heavily influenced by the Pussycat Dolls.

Kahi revealed that she was inspired after watching the American film Drumline, and had always wanted to do a marching band concept ever since she took to the stage as an After School member.

In June 2010, Raina, Nana, and Lizzy formed a sub-unit, revealed to be named Orange Caramel, and released their first mini-album.

On January 27, Pledis Entertainment announced that they had signed a contract with Japanese record label AVEX TRAX for After School to begin activities in Japan by the end of March.

The title track, "Shampoo", was composed by Japanese producer Daishi Dance,[41] and the music video was released later that day.

The music video for "Let's Step Up", the intro track on the album, featured After School performing a tap-dance routine, which was praised internationally by tap dancers such as Joseph Wiggan.

[45] In June 2011, After School made a cameo as a female idol group, Pure, in the Korean horror film White: The Melody of the Curse.

[46] On June 17, 2011, Pledis Entertainment announced that original member Bekah was to 'graduate' from After School after concluding promotions for Virgin.

In July, Pledis Entertainment announced that After School would separate into two sub-units, A.S. Red & Blue, as part of the group's second comeback project for the year, with the units releasing "In the Night Sky" and "Wonder Boy" respectively.

[56] After School ended the year by headlining the MTV EXIT live concert along with American band The Click Five on December 17, 2011, in Phnom Penh, Cambodia.

The regular edition of the album also included a Japanese version of Orange Caramel's "Shanghai Romance" as a bonus track.

[62] On April 23, 2012, Avex Trax announced that After School would release their fourth Japanese single, "Lady Luck/Dilly Dally", on June 13, 2012.

On June 5, Pledis Entertainment announced that Kahi would graduate from the group to pursue a solo career, as well as to study acting.

After School's tour finished on June 17 at Tokyo Dome City Hall, which was also the last time Kahi performed with the group.

On January 28, 2016, Pledis Entertainment announced that Jungah had graduated from the group after seven years of activity due to the expiration of her contract.

In the drama, she played the character of Kang Hye-soo, a single mother with a terminal illness who enters into a contract marriage.

In November, Uee starred in the MBC drama Night Light, alongside Jin Goo and Lee Yo-won.

Kaeun had been focusing on her DJ gigs, and had confirmed an acting debut in pre-produced drama The Idolmaster KR, which premiered in early 2017.

E-Young opened a music academy on September 19, featuring piano, vocal, bass, and electric guitar lessons as well as dance and singing classes for those wishing to become idols.

[citation needed] On May 31, 2017, Pledis Entertainment announced that Uee had graduated from the group after eight years of activity due to the expiration of her contract.

[82] On May 1, 2018, Pledis Entertainment announced that Lizzy had graduated from After School after eight years of activity due to the expiration of her contract.

[84] Days later, it was reported that Kaeun will be the center for the Korean group in "Nekkoya (Pick Me)", Mnet's Produce 48 official song, confirming her participation in the show.

[89][90] On July 5, 2019, Kaeun released "Remember You" (기억할게) her first digital single that marked her departure from Pledis Entertainment.

In December 2019, E-Young announced on Instagram that she also left the group and company following her contract expiration and she is working on her solo album.

On June 3, 2021, members Jungah, Jooyeon, Bekah, Raina, and Kahi reunited as After School as part of a guest appearance on SBS' internet program MMTG for its special Hidden Gems segment.

[92][93][94] After deciding on "Bang" and "Diva" during the program, the five members performed the two songs as part of MMTG's Hidden Gems concert on June 12.

On June 29, 2011, After School became the models for The Saem Cosmetics alongside popular star Lee Seung Gi.

In September 2011, they became endorsement models for Landrover Shoes[106] with members Kahi, Juyeon, Uee and Nana releasing a commercial film for the brand.