of Kim Donghyun, Shim Hyunseong, Lee Jeongmin, Cho Youngmin, Cho Kwangmin and No Minwoo. The group has released three Korean single albums. They debuted on  Mnet 's  M!Countdown  on May 26, 2011 with their debut single "Boyfriend", which was produced by Brave Brothers. Their fanbase was officially named "Best Friends" as