I planned to watch this drama with the idea in mind that this would've probably been the last work of JaFirst as a couple.
While I enjoyed the couple's previous drama(s) - disclaimer: they weren't and still aren't one of my favourite couples - this one was a mess.

Acting: Ja was given a terrible role, and i'm not sure if it was his fault or the production, but this Pun(n?) was hideous.
Seems almost like he is autistic (while he's clearly not intended). I had difficulties not skipping his scenes altogether.
First was super stiff for almost all drama.
I laughed at the scene in episode 11 when he went nuts (one moment was crying, the other one laughing and reassuring himself). This scene was the only "realistic" scene for me.

The amount of cringe during the whole series is immeasurable.

Plot: I actually liked the idea of the commoner that fell in love with the idol/actor, but it was dragged and then butchered.
Idea: good - Execution: No good.

The second couple: I have mixed feelings about them. While I enjoyed the explicit scenes... there was no character development. A bummer.

Evil characters: Honestly? Again, they were cringy.

In summary, I wouldn't recommend this series, unless you're desperate for some sexy action.