The above clause I would use to define this drama.
One of the greatest, most meticulous and manipulative drama you'll ever see.
It starts slow, in fact very slow, but rarely I've seen it happen that the start that's been slow and by each and every episode it attains the best pace and theme possible.
In fact, the last episode was the best episode of this drama.

TBH , I was going for an 8 or even a 9 rating for this drama, until I saw the last episode changed everything, It Just amazes you.
The way this drama sparks your curiosity is phenomenal.

The casting is spot-on, acting is god level and the characters are so distinct.
The direction is absolutely stunning.
Cinematography is full of details.
The plot is kinda in reality check zone.
One of the best dramas I've ever seen.
The way this has been written is its absolute strength.
Such an interesting and fun drama to watch.
It's PERFECT.

You'll love this only if you're into mature things.
I would say by the looks of other reviews this drama is way too underrated.
If you're one of those you get confused with depth of direction and plot, this ain't for you. PEACE!