Lee Sin is popular in his high school for his band "The Stupid", and his female schoolmate Lee Gyo Won is devoted to traditional Korean music. Lee Sin's father, Lee Hyun Soo, was a popular guitarist in his time but is now on the verge of death because of drug addiction, which also caused his separation from Song Ji Yeong, Lee Sin's mother, long ago. Lee Gyo Won's grandfather, Lee Dong-jin, is one of the top three traditional musicians of his age, and his biggest wish is to see his granddaughter become a traditional-music prodigy. He's strictly against modern music, which he believes misleads the tradition. The high school comes up with "The 100th Year Anniversary" where students get the opportunity to show their skills. Can Lee Sin prove his skill in modern music like his father did? And will Lee Gyo Won be able to keep up her grandfather's expectations? Or is something else waiting for her?