Mr. Idol (2011)

Cast
Park Ye-jin (박예진) as Oh Goo-joo (오구주)
Ji Hyeon-woo (지현우) as Lee Yoo-jin (이유진)
Kim Soo-ro (김수로) as Sa Hee-moon (사희문)
Im Won-hee (임원희) as Park Sang-sik (박상식)
Jay Park (박재범) as Ji-oh (지오)
Ko Chang-seok (고창석) as Han Jong-tak (한종탁)
Jang Young-nam (장영남) as Lee Mi-ri (이미리)
Joo Jin-mo-I (주진모) as Yoo-jin's father (유진부)
Jang Seo-won (장서원) as Hyeon-i (현이)
Kim Randy (김랜디) as Ri-ki (리키)

Trailer

Synopsis
Gu-ju is once a famous producer who left the music industry after one of her idol group members died of accident. One day, she encounters Yu-jin who was kicked out of an agency called ‘Star Music’ after years of training to be a singer. Gu-ju believes Yu-jin could be a star and produces an idol group called ‘Mr. Children’.
The talented group, ‘Mr. Children’, attracts public attention and their fans increase exponentially. Seeing this, ‘Star Music’ uploads the video of Yu-jin when he was a trainee in order to slander Yu-jin. As a result, Gu-ju, Yu-jin, and the members of “Mr. Children” face a hard time.