called "Super Junior-[suffix]"; for example, Super Junior-K.R.Y., T, M, and Happy. K.R.Y. stands for "Kyuhyun-Ryeowook-Yesung" and is all the "singers" of SuJu singing pretty songs. T stands for "Trot" and they focus on the particular ( slightly strange ) genre of Trot music. " Happy " is just...another subgroup singing happy