Song Myung-ja, heiress to the Song Song music conglomerate, approaches her former school rival, now a private detective, Park Bu-ok, with her father's will. The condition for inheriting the group is to find four musical prodigies once scouted by the late Chairman Song and lead them to victory in the Song Song Audition. Using the Chairman's diary as a clue, they locate the four boys, but they lead lives far removed from music: a pickpocket, a backup dancer, a food delivery worker, and a high schooler suffering from bipolar disorder. As the audition date nears, Myung-ja and Bu-ok put the four troublemakers through rigorous training. Gifted with natural musical talent, they quickly find their rhythm and form the "Recycling Band." However, they face a persistent detective, a scheming vice-president, and fierce competition. An animated adaptation of Cheon Kye-young's popular manga.