AJ (born 이기광; Pronounced "Lee Gi Kwang") was a solo-artist under Cube Entertainment. He began his singing career training under JYP Entertainment for four years, but was then transferred to their sister entertainment company, Cube Entertainment, where he debuted with his first mini-album, First Episode A New Hero, Released on 10 April 2009. He began promotions for the mini-album with the song "댄싱슈즈" (Dancing Shoes), and followed up promotions with "눈물을 닦고" (Wipe The Tears).