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Formed in 2008 by South Korea's S.M. Entertainment, Super Junior-M became the third and most successful subgroup branched off from the Korean band Super Junior. The sub-unit originally consisted of leader Han Geng, Donghae, Siwon, Ryeowook, Kyuhyun and two additional members appearing exclusively to the subgroup, Zhou Mi and Henry. In December 2009, Han Geng filed a lawsuit against S.M. Entertainment and decided to leave the main group and sub-unit, resulting in the sub-unit's temporary disbandment.