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 separate 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. Being amongst the most vocally powerful members of Super Junior, Super Junior-K.R.Y. are credited to singing mournful ballads, 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.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 additional original soundtracks, one track in the soundtrack of Snow Flower and Billy Jean Look at Me OST. Unlike Super Junior's second sub-unit, Super Junior-T, K.R.Y. has not officially released a single or album, and has only participated in collaboration albums and original soundtracks.