I've watched thousands of K-drama since I was a kid.
This K-drama is phenomenal, I don't think I've seen so many GREAT actors in one show. Their emotions and rationality, the message, everything was perfect. Describing how amazing this show was is ineffable. This is unlike any K-drama with whirlpool of misunderstandings-this touches reality. Many messages and significance with Korean culture was depicted as well!
Try it for yourself.