In February 2011, A Cube Entertainment announced the first trainee for new girl group Apink was Son Na-eun, who featured in Beast's "Soom" (숨; "Breath"), "Beautiful" and "Niga Jeil Joha" (니가 제일 좋아; "I Like You the Best") music videos in late 2010.

[6] In March, Jung Eun-ji was introduced as the fourth member on A Cube's Twitter account through a video of her singing a rendition of Jennifer Hudson's "Love You I Do".

The episodes were hosted by various celebrities, including G.NA, Mario, MBLAQ's Seung Ho and G.O, Beast, 4Minute, 2AM's Jinwoon, and Secret's Sunhwa and Hyoseong.

[13] The group released their debut EP, Seven Springs of Apink, and the music video for its lead single, "Mollayo" (몰라요; "I Don't Know"), on April 19, 2011.

[5] Apink also recorded the song "Uri Geunyang Saranghage Haejuseyo" (우리 그냥 사랑하게 해주세요; "Please Let Us Love") for the SBS drama, Protect the Boss, the soundtrack of which was released in September 2011.

[16] In November, Apink began recording a reality television show called Birth of a Family with boy band Infinite.

[18] The promotions for "My My" included a one-day idol tea café, serving fans to raise profits for charity, where the group members prepared the food and drinks themselves.

In December, Apink and Beast released a music video of the song "Skinny Baby" for school uniform brand Skoolooks.

[26] For season 3, which began to air in June 2012, Apink members contributed as writers, camera operators, directors, and in other production jobs.

The group began promotion of the album with weekly appearances on music programs to perform the title song "Hush" through June.

[39] On January 13, 2014, Apink released "Good Morning Baby", a song composed by Duble Sidekick, to celebrate the 1,000th day since the group's debut.

[41] Their fourth EP, Pink Blossom, and the music video for its title track, "Mr. Chu", by Duble Sidekick, were released on March 31.

[45] In June, Bomi and Namjoo formed a sub-unit called Apink BnN, which released the single "My Darling" for Brave Brothers' 10th Anniversary Project.

The single "Break Up to Make Up" for the project A Cube for Season #Sky Blue, featuring Eunji and label mate Huh Gak, was released on July 8, ranking first on Gaon's weekly digital chart.

[81][82] Apink released a single entitled "Promise U" on April 19, written by Jeong Eun-ji to commemorate the group's fourth anniversary.

[89] In November, Apink announced their first tour in North America and were scheduled to perform in Vancouver, Dallas, San Francisco and Los Angeles.

[93] Apink started their North American tour on January 5, 2016, in Vancouver, followed by shows in Dallas, San Francisco and Los Angeles.

[99] On April 19, Apink released a digital single entitled "The Wave", written by Park Cho-rong to celebrate their 5th anniversary along with a photobook called Girls' Sweet Repose.

[100][101] Apink performed alongside international acts OneRepublic, Far East Movement, Bebe Rexha and Filipino artists Gary Valenciano, his son Gabriel, James Reid and Nadine Lustre for MTV Music Evolution in Manila on June 24.

[105] Apink released their third full-length Korean album, Pink Revolution, on September 26, following a hiatus of one year and two months, the group's longest since debut.

The title track, "Only One" (내가 설렐 수 있게), was used to promote the album along with B-tracks "Boom Pow Love" and "Ding Dong".

Apink worked with Black Eyed Pilseung for the title track, as well as well-known producers such as Shinsadong Tiger and Dsign Music for the B-sides.

[112] On November 30, Plan A Entertainment announced that Apink would be returning on December 15 with their first special album, Dear, despite rigorous activities and promotions throughout the end of 2016.

[119] As a collaboration with labelmates Huh Gak and Victon, Apink released "Oasis" on August 3, a remake of the 2007 Brown Eyed Girls song.

[125] Billboard chose the title track as one of the 20 Best K-Pop Songs of 2018, noting that "it felt a bit meta -- as the six-member girl group swapped out their girlish image for something far more compelling.".

[126] In August, Apink embarked on another Asia tour, visiting Hong Kong, Kuala Lumpur, Jakarta, Singapore, Tokyo and Taipei.

To promote the new album, Apink performed "Dumhdurum" on various music shows, along with B-side tracks "Be Myself", "Love is Blind" and "Moment" for a period of two weeks beginning on April 17.

[142] In June, IST Entertainment announced that Chorong and Bomi will be forming Apink's new sub-unit called "ChoBom", and will be releasing their first single album Copycat on July 12.

[150][151] In 2012, youngest member Hayoung stated, "Other girl groups these days tend to highlight their dancing skills and sexy looks, but our concept was an innocent and pure image.

Meanwhile, title track "Remember" is a 'cheery synth-pop tune that reminisces about a love during the summertime,' and 'features a quick rhythm and vintage sound to beat the summer heat,'.