Super Junior or simply, SJ or SuJu, is a large thirteen member K-pop boy band formed by SM Entertainment in 2005. Specializing in various talents of singing, dance, hosting, and acting, they have achieved outstanding success in South Korea, China, Taiwan, Thailand, and other East Asian countries. The group initially debuted with twelve members on November 6, 2005 with their first promoted single, "TWINS (Knock Out)". The original twelve members, in age order (from oldest to youngest), are Leeteuk (the leader), Heechul, Han Geng, Yesung, Kang-In, Shindong, Sungmin, Eunhyuk, Donghae, Siwon, Ryeowook, and Kibum.