Rudy, once Rude Boy, used to be big on the French sound system scene. But meeting Ambre, who doesn't approve of his passion, makes him change his lifestyle and become a marketer. A few years later, now married and father of two, Rudy meets his old teammate. Together, they realize that the flame of sound system is still burning in their hearts and try to join their old band again, now run by the only remaining member who stayed true to the music. Ripped apart between his white collar life and his passion, will Rudy manage to conquer the underground scene once again?