[2] Baro, the rapper of the group, was scouted by a company representative who came across his photo posted on his friend's homepage on the social network Cyworld.

At his audition, Baro sang Sumi Jo's "Once I Leave" and Sung Si-kyung's "The Road to Me", as well as rapping and beatboxing.

Main vocalist Sandeul was approached by a company agent after performing a song by Kim Yeon-woo in a talent show.

Initially, it was believed that B1A4 would be a mixed gender group due to the presence of a female character named Anna in the webtoon.

[5] The same day, WM Entertainment revealed a photo of the first member of the group, leader Jinyoung.

[4] The remaining members Baro, Gongchan, Sandeul, and CNU were revealed on a daily basis between April 12–15.

[16] The music video for the second promotional single "Only Learned the Bad Things" was aired on the first episode.

[27] Before entering the Japanese music industry, B1A4 released a compilation album on January 25, 2012, which consists of all the tracks previously included on Let's Fly and It B1A4 in Japan.

[35] On July 25, B1A4 took part in season six of the reality show Hello Baby, where the group learns to care for children.

[45] From December 8–9, 2012, B1A4 held their first solo concert BABA B1A4 at the SK Olympic Handball Gymnasium.

[57] The group released their second Korean studio album Who Am I, containing twelve-tracks including the title song "Lonely" on January 13, 2014.

[65] It was announced that B1A4 would be appearing at 'The 12th Korea Times Music Festival' and KCON 2014 in Los Angeles, California.

[66] [67] WM Entertainment announced that the group would held their first world tour 'Road Trip'.

[72] In July 2015, WM announced that the group's fifth concert tour, B1A4 Adventure 2015, would begin in Seoul on September 12 and 13, 2015.

[78][79] On November 28, 2016, their third Korean studio album Good Timing was released, with 13 self composed tracks, including the lead single "A Lie".

[80] The group held their first comeback showcase since debut at Yes 24 Live Hall in Gwangjang-dong at 3 p.m. on the same day.

[81][82][83] B1A4 held their sixth concert "B1A4 Live Space 2017" on February 4–5 and 11–12, 2017 at Seoul's Samsung Card Hall with a total 8,000.

[90] On September 29, 2020, WM Entertainment announced that B1A4 would be making a comeback with their fourth Korean studio album Origine and its lead single "Like A Movie" on October 19, 2020.

[99] In an effort to distinguish themselves, B1A4 had also promoted a nickname "saessakdol" (새싹돌, "sprout-dol") and created a so-called "saessakchum" (새싹춤, "sprout dance"), which was showcased in various shows including Quiz to Change the World.

[100] In January 2015, B1A4 members hugged Muslim female fans in a meet and greet session in Malaysia.

On July 19, 2013, as B1A4 prepared for their second solo concert, B1A4 asked fans for school supplies rather than flower wreaths.

[108] They were working with CJ Group's charity foundation "Donor's Camp" to support the education of children who are in need.

[110] In December that year, they participated in a charity event to raise funds to provide those in need with coal briquettes for heating.