super junior divided into different subgroups so they don't limit their activities, and to show that the group can cover different genres.
Super Junior K.R.Y- Kyuhyun, Ryeowook, Yesung
they had similar music qualities, so they were grouped to target a more mature audience. they're credited to singing mournful, R&B ballads since they are the most vocally powerful in the group.
Super Junior- T: T meaning trot. The members are Leeteuk, Heechul, Kangin, Shindong, Sungmin, and Eunhyuk
SM formed this group to revive the old music genre which he saw was dying away.
Super Junior- M- Hankyung, Siwon, Donghae, Kyuhyun, Ryeowook, Zhou Mi, and Henry.
They were formed to focus entirely on the Chinese market as a response to their rising popularity in China.
Super Junior- Happy: Leeteuk, Yesung, Kangin, Shindong, Sungmin, Eunhyuk
Their music style involves contemporary dance music and bubblegum pop. It targets the music industry with their fun and entertaining style.
i hope this helped! sorry it was long! i LOVE super junior too!