Just a masterpiece, and probably most easy to understand kdrama (unlike others which take 3-4 episodes to get you understand).
It's like you got a Revenge seeking foundation whose CEO has good relationship with both the police and thugs !!
Loved the character adaptation of kim do ki in different situations like an octopus.
His silence and rare conversation was too good !!
The best thing about the revenge taken is that the revenge taken by kim doki is exactly same as what they have done, (not like hero came, fought & just killed the villian).