OMG.... To begin with.. I was fully expecting to drop this drama. Only because I felt that this type of drama with KPop idols doing a Kpop story was not going to keep me interested.... BOY HOW WRONG I WAS!!! However, I won't go into any of the drama ... I think it would be best for you to watch it to get the full impact.
First lets look at the casting: What KPop groups are here
A. U-Kiss Lee Jun Young who is your leading male
B. Ateez Jeong Yun Ho who is 2ML
C. SF9 Chani 3rd ML
It doesn't end there... there are several other 3 other Ateez members, SF9 and Boys Republic.
I have to express highly how INCREDIBLE these young men did with there characters, and how extremely well their acting is. I don't know if it's because they are so familiar with how KPop idols deal on a daily basis... so it was easy for them to relate to their characters. However... they still deserve a Standing Ovation. These young men are from different entertainment companies ... and unlike some of their fandom, they worked closely together and respected & worked hard together to make all this happen.
I've only heard of 2 of these groups (Ateez & SF9), not a fan of their music.. however I'm definitely a fan of their acting .
As for the young ladies... the leading lady is only actress, wasn't in music. Park Ji Yeon (LiMa) apparently has plenty of experience in the music field.
Also for Im Na Young the pretty (tea party) .. believe it or not, she's known as a rapper.
Then we have Kim Min Seo (RiAh) the tough one. Who has had musical experience.
All in all.... BRAVO BRAVO BRAVO for doing such an Excellent Job with all the characters.