Before I start: let me just say that this is more of an idol drama so that's to be noted before you watch this. I have found that idol dramas tend to not be quite as good, but some really do pull through like with this one.

This is a great drama in my opinion. It does lean a bit heavy on historical drama cliches but it's got a couple of twists. I wouldn't say it's anything new or refreshing to the drama world. However, that being said, the story is still great and holds its own. The characters are decently fleshed out for a short drama, even including side characters. They could have added more episodes and fleshed them out even more but it's satisfying enough.

The acting is absolutely amazing. You got some really awesome, big-name actors in this drama. Even the ones that aren't, and even the idols in it hold their own.

The costumes are decent and the OST is pretty dang good as well. Although, I have a bit of a bias since Yoseob sings one of the songs haha.
I definitely recommend this drama, especially if you are looking for something serious but not too serious. It's a drama but it has a lot of nice funny moments thrown in as well. It never feels too heavy to watch.