A video of singers K.Will and SS501's Kim Hyung Joon having a 'foot dance' lesson in a waiting room has recently turned viral. A staff present in the waiting filmed their peculiar dance battle, where you can see Hyung Joon teaching K.Will some of his foot dance choreography from his solo debut title track, "oH! aH!". After mastering the foot steps perfectly, K.Will then goes on to performing his newly acquired dance moves with his own ballad song, "My Heart is Racing." Check out the video for yourself down below! Source: SPN via Nate