Which South Korean singer born in 1986 appeares as a guest to the Seoul Concert?
Super Junior-K.R.Y. The 1st Concert:  Super Junior members Donghae, Sungmin dan Heechul along with label-mate Shinee dan TRAX appeared as guests in the Seoul Concert. Lee Sung-min (singer): Lee Sung-min (born January 1, 1986) is a South Korean singer and actor.
Lee Sung-min