A recent video showing Insooni and Huh Gak dancing on stage with Rain at his concert has attracted a lot of�attention. The video was recently uploaded on Youtube and shows Rain calling and introducing Insooni and Huh Gak on stage. After stepping on the stage, they all dance together making the crowd go crazy. An official from Huh Gak's entertainment agency said, "He went to sing the opening theme song at the�Daegu�World Athletics Championships opening ceremony. Coincidentally, there was a Rain concert in Daegu that day so he went with a sunbae singer to see the concert. He was going to watch and leave the concert quietly but Rain spotted both Insooni and Huh Gak in the crowd. That's why during the concert Rain called them up on stage, introduced them, and spent that time together unplanned." On KBS's "Immortal Song 2" Huh Gak performed a surprising headspin defeating Jay Park and revealed a side of him that was previously unseen. Meanwhile, earlier today, Huh Gak released his first mini album 'First Story'. Watch Rain, Insooni, and Huh Gak dancing on stage below: Source + Image: Nate