"[1] Ji Hyun-woo, Jay Park, Jang Seo-won and Randy Kim play four young men who come from different walks of life to form an idol band, united by their love of music.

Though musically talented, they are far from mass-produced pop material, and the movie portrays their rigorous training process under a producer (Park Ye-jin).

[2] Oh Goo-joo was once a famous producer, but she left the music industry after one of her idol group members died in an accident.

One day, she encounters Lee Yoo-jin who was kicked out of an agency called Star Music after years of training to become a singer.

Its members include: the leader Yoo-jin who cares only about singing; dancer Ji-oh who is the one and only person possessing an idol-like air in the band; vocalist Hyun who used to run a karaoke; and rapper Ricky who learned Korean through rapping.