Super Junior-M, is the third sub-unit of the South Korean boy band Super Junior focusing on Chinese market, currently composed of six Super Junior members Sungmin, Eunhyuk, Siwon, Donghae, Ryeowook, Kyuhyun and special member Zhou Mi. The sub-unit is known as the first international music group in the Chinese music industry to have members of both Chinese and Korean descent. The sub-unit has released two studio albums and three EP's since their debut. Formed in 2008, Super Junior-M became the third and most successful subgroup branched off from the Korean band Super Junior. The group was originally composed of seven members: 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 SM Entertainment and decided to leave the main group and sub-group, resulting in the sub-group's temporary disbandment. After a year-long hiatus, the group returned with additional Super Junior members Eunhyuk and Sungmin, following with the released of their second EP Perfection in February 2011.