Wendy Son and Kyungsoo Do are cast in the highly anticipated comeback movie of Director Joonho Bong. But what the public do not know is that they are exes who had a messy break up. 

SM Records, home of the best recording artists, is looking for the newest band to sign and what better way to do that than to hold a Battle of the Bands. Enter three bands and the lengths that they will do just to win.