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Super Junior-K.R.Y. is a sub-unit of Super Junior consisting of three members: Kyuhyun, Ryeowook, and Yesung. The group debuted in 2006 with the single "U" and has since released four albums and several singles. Super Junior-M is another sub-unit of Super Junior, consisting of four Chinese members and two Korean members. The group debuted in 2008 with the single "Me" and has since released three albums and several singles.