A real, yet unusual k-drama, very high level.
Wonderfully acted (and the roles, especially the lead ones, are far from being easy), solid plot, very much mature.
If you're more into things like Playful Kiss, this drama may disappoint you because it's clearly thought for an adult audience. No cheesy lines, no barely there kisses, this a real thing with characters with real pains who interact in realistic ways in hard, realistic circumstances.
Prepare your tissues but please, stay till the end, because it deserves it! 10!
Loved the OST, too.