To start off, its 50 episodes long, unsatisfying, and could/should have been shorten to create a better show overall. The title is should have come with a disclaimer, or at least be more honest as simply, "A bad guy." Why? Because this was supposed to be a revenge drama where the main character becomes a monster and enact his revenge, but what you get is a main character that does nothing while the antagonist continues doing some bad things. There was really no monstrosity, only some bad stuff you would expect from a bad guy.