Lee Sung-min 李晟敏; born January 1, 1986), mononymously credited as Sungmin is a South Korean singer, dancer, DJ and Musical theatre 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-H and Super Junior-M.Sungmin was born in the Ilsan district of Goyang, Gyeonggi. He has a younger brother, Lee Sungjin. Sungmin's father Lee Chun-hwa, is the CEO of two companies: SendBill, which creates e-tax software, and Network Mania, an analytics company.

In 2001, he entered the SM Youth Best Contest and jointly won first place for the Best Outward Appearance award with future band mate Donghae. Together, they signed a contract with SM Entertainment and received training in singing, dancing, and acting.