I dropped this after 8 episodes, before resuming my watch months later.
I thought it became rather stale at that time, but the development picked up quite a bit in the second half.

There's nothing groundbreaking in the story and the writing is pretty average.
What saved this drama was the directing, which elevated the writing above what it was.
Chemistry was very good, which was unexpected for me since I couldn't see it by their visuals alone.
They make quite lovely onscreen couple, SHK and PBG.

I love love love the OSTs. Made way into my playlist which I kept on repeating for quite a while after I finished watching this drama.
Still listen to them sometimes now.