Well I hope I'm not liking it because it's westernised, but I find the story entertaining, I could see several seasons of it.
There are no real cliches, no disappointments (unless you wanted romance, but with a bit of experience you know this is not the kind of drama to really provide much on that front), interesting situations, some that could have been developed more maybe, but then it means that the whole season is tight, not too long.

I also really love that the main character isn't under 30.

Language level IMO: B2/C1
Language-wise for Korean learners I would say it's upper intermediate/advanced, there was a new or unfamiliar-yet word for me in most sentences, but nothing that wouldn't be useful. I've already come across several words I just learnt here while watching other stuff in the week since I started it. It's very worth using for sentence mining if you're into Ajatt/Refold.