SPOILERS ARE THERE.

Recently,after watching SKJ in vincenzo ,DOTS and MCW in FOE , got interested in their previous works. So came to watch this drama. Will write down a few points , completely my personal opinion. Absolutely no issues if someone agrees or disagrees with it.
CAST- SJK as ML was good and the most engaging part of the show. His character looked well written and darker than other dramas. MCW's character Eon Gi looked somewhat vulnerable in parts. The character depth of Jae Hui was lost somewhere around the mid part of the drama . Other cast looked decent also. SJK is the most engaging part of this drama and his performance can keep you hooked.
STORY- Started off well , ended in a horrific manner with keeping many loose ends. It seemed that the ending was written in a rushed way. The Group of Companies just vanished into thin air with a stab injury leading to memory loss LOL. Around episodes 7-8 this revenge thing was cleared and then memory losses came into picture. But yes it was engaging till the penultimate episode.
MUSIC- OSTs were good along with background score.
ENJOYMENT - YES , definitely enjoyed it watching , there were very less boring scenes or episodes. Its the last episode or ending that messed up my viewing experience. Not only the ending was rushed, but also it seemed meaningless to have such ending in a revenge drama.
OVERALL - Decent one time watch . Will not watch it again.