NON SPOILER REVIEW :
If you ever ask me about how people take revenge , I will do nothing but tell you to watch this drama and this is how you do it but in the end just remember revenge is self destruction and nothing else which was the message of this drama .

This was the best revenge drama one could come across . By far the best .
The execution was dumbfounding .
Each and everything was planned .
Zero plot holes . The way Kim Nam gil manipulates , moreover seduces is dumbfounding .
Ep 1-14 were excellent .
After that it turn into sorry to say to kinda disappointing pathetic melodrama , like a shit of the plot made till now but I think that was to make up for the ending episode . Originally it was planned for 20 episode it seems .
Anyways Ep 17 was good .
It has an ironical ending .
There's a big hint about the ending in this drama . ???? Try to catch it if you can.
Also Kim Nam Gil went to the military perhaps that's why a scrappy ending but still nice one .

Thus ,
Final rating 9/10
I enjoyed each and every moment of it till episode 14 .

P.S : Not so many female leads make me waver or feel something , First time i felt this way was with Song Yoon Ah in the K2 , this time it was Oh Yun Soo in this drama . She's totally mesmerizing . The way she looks and acts . I admire her . ^^