Lee Gi-kwang (,
Hanja: ; born on March 30, 1990) is a
South Korean idol,
singer,
dancer and
actor. He was a solo singer under
Cube Entertainment, also known by his stage name as "Ace Junior" (AJ) when he debuted. He released his first Mini Album "First Episode A New Hero" which features the works of the famous composer Brave Brothers. He is the main dancer, lead vocalist and visual of
Beast.