Rock band YB's singer Yoon Do-hyun revealed his story of envying Lee Juk.

On a recent shoot of SBS' 'Strong Heart' Free Soul Special, Yoon Do-hyun exposed that "17 years ago, I was jealous of Lee Juk whom I debuted with."

"In 1994 I first debuted with a solo, and Lee Juk debuted that same year." explaied Yoon Do-hyun. He went on to say, "Lee Juk debuted in the group Panic with the hit song 'Snail', and I debuted with the song 'Tarzan' which drew no interest at all, so I went through a time of unpopularity."

Yoon Do-hyun said, "Seeing Lee Juk do well, I honsetly was envious." And he revealed, "Actually, since we knew each other before debuting, I was more conscious of [his fame]." This statement made many wonder what sort of relationship they had before debuting.

On this shoot of 'Strong Heart', besides YB's Yoon Do-hyun, Heo Joon, Jun Jin, Andy, Hyeunee, In-young Seo, Jae-eun Lee, In-seo Kim, Jae of Trax, Jeong-mo, and Ol-ben appeared. Broadcast will be on December 6 at 11:15 PM.