Super Junior, also known as SJ or SuJu, is a South Korean boy band formed on November 6, 2005, by producer Lee Soo-man of SM Entertainment. The group comprised a total of thirteen members at its peak. Super Junior originally debuted with twelve members, consisting of leader Leeteuk, Heechul, Hangeng, Yesung, Kangin, Shindong, Sungmin, Eunhyuk, Siwon, Donghae, Ryeowook, and Kibum. Kyuhyun joined the group later in 2006. Super Junior launched into international recognition following the release of their best-selling single "Sorry, Sorry" in 2009, the title song of their most critically successful album, Sorry, Sorry. Over the years, they have been divided into smaller groups, simultaneously targeting different music industries and audiences. Individually, the members have also branched out into hosting, presenting and acting.