Just finished watching this show. I watch a lot of Korean movies/shows, but this was unlike any of them! With being made for Netflix, so western audience, I guess. I was very surprised at content.
Lots of sex scenes (very well done, unlike western stuff which I usually find cringeworthy), nudity, maturation, etc.
There was quite a lot in it that made no sense to me but enough good quality writing to make me say it was well worth watching. I thought Episode 3 was brilliant and the story could have been a stand alone movie.
I usually watch Korean stuff as normal, just with English subtitles. Best way to watch as the dubbed English versions often can be *very* different.