On December 19, in an episode of Mnet's show, "Rain Effect," wherein Rain was in the backstage of the "2013 MAMA."
Rain has visited his friends, Lee Hyori and DJ DOC member Lee Haneul, while waiting backstage. Rain told Lee Hyori, "I didn't recognize anyone while I was walking over here."
When Lee Hyori heard it, she asked, "Don't you know all of the girl groups? Didn't you memorize all of the [girl groups] members' names when you were in the military?" Rain answered truthfully and said, "I did."
He then said about his military experience and said, "Do you know what our morning bugle was [in the military]? The senior officers turned on IU's song when they woke up in the morning. I even memorized the choreography. If they asked me 'Hyung, can you dance to the song?' and I would [dance for them]." Rain then showed IU's dance.
As he saw Rain's arm movements Lee Haneul reacted, "Isn't this too much?" and Rain replied, "But this is part of the choreography."
Lee Hyori was then reacted Rain saying, "This is too provocative. I didn't realize it when IU did it, but it looks dirty when you do it."