Could've done with more of the workplace harassment storyline and less of the mother's histrionics. If you can get past the irritatingly frequent interjections of Tammy Wynette, it's a good exploration of the way that some East Asian parents infantilise their offspring well into their adult life and the issues this can cause for individuals and families.
So after a confusing start, the plotlines and characters become more distinct as the show goes on. In the end, I personally enjoyed it better than Prison Playbook, even though there are obvious stylistic similarities. I think this was because there were more main characters with fully fleshed-out arcs, which made for more variety over the course of the long episodes. The band montages could've been edited down significantly. Despite some inevitable teary moments, this was a low-key, light-hearted and quirky show about friendship.
It was all a bit juvenile and lacked any interesting subplots which would've added some substance. Han Gain is not very good at acting. Other performances lifted this into "decent" territory. And it was nice to see baby Kim Yoojung and Kim Sohyun.
Simplistic comedy sageuk for non-sageuk watchers. Nam Jihyun gave it her all but I didn’t find D.O. and his constant shocked Pikachu face particularly convincing as a Crown Prince. The Queen and her subplot all but disappeared towards the end. Lots of potential wasted in failing to flesh out the story of Hong Shim and her adoptive father, as well as the Crown Princess and Muyeon's relationship. Bombastic ending didn't fit the tone of the drama. Character motivations were sometimes rather inscrutable. Overall, enjoyable enough to pass the time but quite forgettable.
As others have said, this is not a "k-drama". It is, however, a beautifully filmed and well-acted story of Korea in the twentieth century. Highly recommended for anyone who is at all interested in modern Korean history and the collective memory and psyche of Korean people today.