B1A4 (Korean: 비원에이포) is an all-male South Korean K-pop group under WM Entertainment. The group made their debut in 2011 after being introduced through a webtoon. To date, they’ve released nine studio albums (4 in Korean and 5 in Japanese). Oh My Girl was announced as a sister group to B1A4, but has since eclipsed B1A4 in terms of staying power and success. The group’s members include CNUm Sandeul, and Gongchan. Former members include Jinyoung and Baro.