B1A4 is a South Korean boy group formed by WM Entertainment. The group debuted on April . The group released their second Korean studio album Who Am I and the title song "Lonely" on January 13, SeeYa, Gavy NJ () ; F.T. Island, Wonder Girls, Girls' Generation, Younha (); SHINee, Davichi ( ). 년 1월 12일 없구나 (Lonely). eopguna “You're Not Here (Lonely)” [Album] Who Am I Jinyoung, CNU, Baro, Sandeul, Gongchan, Lyrics/작사.