On the latest recording of Mnet's 'Vol. TEN', MC Supreme Team's Simon D revealed that he had once rejected a featuring in IU's song and named it as the worst mistake of his 20's.

Right after IU had released her hit track, "Nagging", she had asked Simon D for a feature in another song. Unfortunately, Simon D had been too busy to accept the request. "I was so busy then that I had no choice, but to reject it. I'm so apologetic now that I can't even talk to her first."

Not only were his fellow MCs surprised, but they jokingly reprimanded him for the decision.

Im Jin Mo, who's a self-declared fan of IU, hilariously replied, "Rejecting a request from IU is worse than denying an order from your parents." Jung-In added, "Simon D, you're quite amazing to have rejected IU."

Simon D joked back, "Yes, I consider it the biggest mistake of my 20's."

Source + Photos: Newsen via Nate