Plot[edit]
Lee Shin (Jung Yong-hwa) is a university student majoring in Western Music. He is also the vocalist and guitarist of a band "The Stupid." Shin is known for his good looks, cocky personality, and strong passion for music. Everyone sees him as a cold-hearted and distant person, but he has a soft side inside him hidden away. He lacks interest in anything unrelated to music and has neither dreams nor plans for the future. He initially likes Jung Yoon-soo (So Yi-hyun), a dance professor at the university, but this all changes when he meets Lee Gyu-won (Park Shin-hye).
Lee Gyu-won is a jolly, bright, and outgoing student who was born into a prestigious family and is majoring in Traditional Korean Music. She plays the gayageum. Gyu-won's grandfather, Lee Dong-jin (Shin Goo), is one of the top 3 traditional musicians of his age and his biggest wish is to see his granddaughter become a traditional music prodigy. Trying to live up to her grandfather's expectations, Gyu-won immerses herself in practice and becomes a university student who knows nothing much outside of her studies. As her friends are fans of "The Stupid," she was forced to go to the band's concert with them. There she saw Lee Shin performing live, and is immediately captivated by him.
Yeo Joon-hee (Kang Min-hyuk) is a bumbling, shy, and ever hungry boy who doesn't act his age. He has a childlike personality, is a shaggy idiot by day, and Stupid's lead drummer by night. During one of his shaggy phases, he comes across university princess and chairman's daughter, Han Hee-joo (Woori), who he immediately falls head over heels for, calling her his "Natasha." However, there are dark sides to Hee-joo's personality than his naïvete knows, and in the series, he fights between his ever-growing feelings for Hee-joo and helping his friends as she threatens their university lives.
When Gyu-won decides to join the performances for the upcoming 100th anniversary performance for the university, everyone sees her potential and talent, particularly Kim Suk-hyun (Song Chang-eui), a Broadway composer-turned-music director. Fearing that Gyu-won might outshine her daughter, Hee-joo's mother schemes with Im Tae-joon (Lee Jung-heon), one of the school's administrators; they plot to destroy Gyu-won's image to force her to quit the performance.
