From September 2006 to September 2007, Yesung was host for radio program, "M.I.R.A.C.L.E for You", where members of Super Junior often appeared as guests. However, before the radio show's first anniversary, Yesung left in order to concentrate on Super Junior's second album, "Don't Don". The last air date for the radio show was September 8, 2007. In November 2006, Yesung, along with Super Junior members Ryeowook and Kyuhyun, formed a subgroup, Super Junior-K.R.Y., a group specializing in R&B ballads. The trio debuted on November 5, 2006 on KBS's "Music Bank" with performing Hyena soundtrack called "The One I Love".