AOA (Korean: 에이오에이; an acronym for Ace of Angels) is a South Korean idol girl group and band, produced by FNC Entertainment. The five-member band consists of Choa, Jimin, Yuna, Youkyung and Mina, and the seven-member idol group consists of all the members except Youkyung. The group debuted on July 30, 2012, with their single album Angel's Story.
Mamamoo (Korean: 마마무; stylized as MAMAMOO) is a four-member South Korean girl group under the management of WA Entertainment. The group consists of members Solar, Moon Byul, Whee In, and Hwa Sa. They officially debuted into the Korean entertainment industry on June 18, 2014 with the song "Mr. Ambiguous."
Ladies' Code (Korean: 레이디스 코드) is a South Korean girl group formed by Polaris Entertainment in 2013. Consisting of leader Ashley and members Rise, Sojung, Zuny, and EunB, they made their debut with the mini-album Code#01 and the lead track "Bad Girl", which was released on March 7, 2013. On September 3, 2014, member EunB died in a car accident which also left Sojung and Rise with serious injuries; the latter of whom remain in critical condition.