Currently I'm reading the manga and I like it more than a live version. My opinion ist that the writers have been more focused on idol's daily routine: difficulties they face each day, struggles, k-pop industry and the love stories between the charachters are very superficially presentend. In manga they are waaay better! I think that they just put some love sweet-flirt-realationship stories just to satisfied us watchers but didn't work on it better. Some charachters were very good portrayed (La Ri-Ma, Yoo Ri-A, Ji-Hak...) and I find it better in drama then in manga or opposite. My favorite charachters in drama were Hyeok and Do-Jin, they were to funny. I laughed to every scene where they were. I like the bromance between those two guys and Ryeok. It was hillarious. xD
Le Ma-ha... Hm... I don't know what to say about that charachter and the actress. She was just ok. Nothing special.
Yi-Hyun and Yoo Ri-A where cool. Although they didn't have much scenes, but they were really good. I liked the chemistry between them. It's sad that they didn't have more scenes togheter.
Ryeok - the actor did a great job. He was hillarious,
The chemistry between ML and FL was too weak.

OST - that is the only part that I can give a ten star. I love the music and performances.

Overall, this Kdrama is very good. It introduce you to the k-pop industry and shows some negative sides of being an idol. The plot is interesting, each episode makes you wanna watch more, but I think that the writers could have done it better according to comic version. Some actors/actress-singers did a great work, but some charachters were not good potrayed (like Sim Hyun-Ji and Lee Yoo-Jin) and I think this Kdrama could have more episodes or maybe second season.

Rewatch value: yeah, but some scenes...