Super Junior-K.R.Y, created in late 2006, is a trio formed by Super Junior members Kyuhyun, Ryeowook, and Yesung. The label discovered that these three members developed a particular persona and subsequent fan-base that was seperate from the rest of the group, and how they also had similar musical qualities. The label therefore grouped these three members together to perform particular songs to target a particular audience. The members of K.R.Y are amongst the most vocally powerful of the members of Super Junior, and have developed a marketable style as the mournful ballad singers (a style that has proven very popular in recent years, although stagnation in the style's development is causing it to lose its once fresh evocative power).

K.R.Y.'s first official performance was on November 5, 2006 on KBS's Music Bank^[57] and have been showing live performances only ever since^{[citation needed]}. They have participated in the original soundtrack of the tvN drama Hyena with a total of three tracks, including the main theme. The trio also contributed tracks in two more different original soundtracks, one track in Snow Flower's soundtrack and another track in Billy Jean Look at Me's soundtrack. Unlike Super Junior's second sub-unit, Super Junior-T, K.R.Y has not released a single or album, and has only participated in collaboration albums and original soundtracks. It is not sure whether or not the trio will continue to do activities away from the mother group.