Flight B1A4: Profile

B1A4 (비원에이포)
There’s a new idol group in town, and they’re boasting a concept that’s quite unique. Named ‘B1A4‘, the group was first introduced through an online comic series, or ‘webtoon’. Debuting as 5-Member Group, Consisting of Jinyoung (Leader) Baro (Rapper) Sandeul (Main Vocals) Gongchan (Maknae) CNU (Vocals) under WM Entertainment. They Debuted with "Let's Fly" as their 1st Mini Album and O.K. as Their Title Track.Their group name, B1A4, has been explained as being due to one member having B blood type, and the other four having A blood type. It also stands for "Be The One, All For One"

Official Thread for International Fans: B1A4 Thread @ Soompi.com‖B1A4 Thread @ 6Theory.com
International Fans Forum: FLIGHTB1A4 International Forums
Fanmade YouTube Channel: FLIGHTB1A4‖B1SSubs

Members:
Jinyoung - Leader, Lead Vocalist
CNU - Vocalist, Rapper
Sandeul - Main Vocalist
Baro - Main Rapper
Gongchan - Maknae, Vocalist

Debut(2011):"O.k"
B1A4 debuted on April 21, 2011 with their debut track 'O.K' off of their album 'Let's Fly' and released a music video. They were first introduced to the world through the creative marketing of webtoons before their actual pictures were released.[1] Their debut album 'Let's Fly' includes a song written and composed by the leader Jinyoung. As rookies, this garners much interest being that most debut albums contain little input from the members. They made their live debut on April 23, 2011 on MBC's Music Core.