Lee Sung-minwas born on 1 January 1986, mononymouly credited asSungmin( Hangul : 성민, Hanja : 晟敏) is a South Korean singer, DJ and actor. He is best known as a member of the K-pop boy band Super Junior and its sub-groups Super Junior-T , Super Junior-Happy and Super Junior-M . He is considered to be one of the four main vocalists of Super Junior.