The group's final lineup was composed of six members: Chaekyung, Chaewon, Naeun, Yena, Rachel, and Jinsol.

[2] April's formation was first announced by DSP Media on February 9, 2015, following their previous girl groups Fin.K.L, Kara and Rainbow.

[12] On February 12, 2016, DSP Media announced that the group's fan club name was "Fineapple" (Korean: 파인에플).

[18] On August 21, the group held their first solo concert, titled Dream Land, at the Baek Am Art Hall in Seoul, to celebrate their first anniversary.

On October 29, Hyunjoo announced her departure from April, following a seven-month hiatus, in order to pursue an acting career.

[28] On April 4, they released the tennis-court-themed music video for the single "Sting", through the first episode of their reality program A-IF-Ril.

[38] On January 30, 2018, DSP Media through the group's Twitter revealed the upcoming secret single set to release for February 7.

[40][41] On February 1, it was revealed that the upcoming subunit consisting of members Jinsol and Naeun would release a song "My Story".

[44] On March 22, DSP Media announced that April was set to make its Japanese debut sometime during the following month.

On September 17, the news outlet OSEN released an exclusive report about APRIL making a fall comeback.

In the post, he claimed that Hyunjoo's departure from the group had not been because she wanted to study acting, but because she had been forced out due to being severely bullied by the other members, at one point even attempting suicide.

[58][59][60] DSP Media has denied that any bullying took place, and announced they would be pursuing legal action against Hyunjoo and her family.

[61][62] As a result, the group has faced heavy backlash, up to and including having members removed from endorsement deals and acting roles.

[63][64] Hyunjoo then posted a statement on her personal Instagram on April 18, 2021, backing the claims of the two netizens who made the accusations.