I know tastes differ and respect other's opinions, but I honestly don't get this whole "it's an idol drama" thing, which I see in a lot of other reviews, at all.
It has a large cast, with some much loved and excellent other main and supporting cast actors. Out them all, only 3 are idols and 2 of those are also credited actors.
Whilst set in an actual Korean kingdom (Silla) and Hwarang being an actual organisation, the drama is not serious, nor is it based on any actual events.
There is a lot of wit (it really makes me laugh), plus plotting, camaraderie, romance, action, intrigue and tears.
The characters are made up of fun, nasty, sad and dark ones. The acting fits the script, which I think is very good, and overall concept.
I love the entire cast and it felt like they had a good time making it.
It is not deep, meaningful, historically accurate or serious; it's what it's meant to be, very entertaining.
The only thing that irritated me, was how often, as the episodes progressed, Ah-ro would cry. She was a confident, principled, feisty, warm and witty character, yet once she fell for Moo Myung, she seemed to cry at the drop of a hat!
I watched it years ago and just finished my second viewing. It made me laugh and cry all over again; as fresh and fun as the first time I viewed it. Plus, unusually for me, definitely one I know I will watch again and again.
Fabulous.