The story is plain and simple.
I am not interested in k-pop or the lives of the actors. I like k-dramas but that is it. Of course some male and female actors i prefer, but i am not interested in their lives...
So, for me, the backstage of professional singers, managers, etc it's interesting as a curiosity view of a major industry.

Choi Se Hoon is a sucessfull businessman that goes berserk when he falls in love without understanding those feelings. He take ages confessing to her...
Yoo Yi Ryeong is a girl that lived isolated from the world and enters in the k pop business as she lived there...

And that's it.
Nice ending, soft plot...

ACTING - didn't find awesome but it was ok.

MUSIC - i don't remember so, for me, not memorable.

PLOT - boring, simple, it is reduced to an egocentric and famous guy that falls in love for the first time.

REWATCH - well, i watch this last year and couldn't remember so i didi it again!

OVERALL - if you are a k-pop fan maybe it is good for you