Amazing nuances mixed with hilariously funny scenes, exaggerated character depictions with heart felt detail. It's a crazy and intense mixture with an incredibly rich and virtuoso sound track, brilliant orchestral instrumentation, and the introductory graphics to the episodes are very well done and effective.
Real life depicted in a truly artistic way. The same as in painting, when an impressionist and somewhat vague painting can say a thousand times more than a nature true photograph.
I hope Korean drama retains exactly this close-to-the-heart exceptional qualities, and doesn't go down the shallow 'reality' and 'cinematic effects' road that define Western, and sadly also some recent Netflix productions that use Korean actors.
It's possible to measure dramas by the music, I found. No cheating there, real composition skills and real live instruments cannot be replaced by fancy electronic sound effects.