management of  Starship Entertainment . The group consists of Kim Donghyun, Shim Hyunseong, Lee Jeongmin, Jo Youngmin, Jo Kwangmin and No Minwoo. They debuted on  Mnet 'sM!Countdown on May 26, 2011 with their debut single "Boyfriend", which was produced by Brave Brothers. Their fanbase was officially named "Best Friends" as of August