No Guitarists on Koong Koong Ttack Planet

Seung-gil, a repeat student who wants to be a guitarist, but is not very good at playing the guitar. One day, Seung-gil is caught imagining himself playing the guitar his father hid in the attic. The guitar is broken, and while Seung-gil is in despair, a strange ball enters his room window, and all the sounds around him become music.