For me the story was a beautiful tragedy with comedy here and there, i loved the plot and its progression although i admit at some point i began to question certain character prejudice.

The acting of ji sung has got to be the major reason i picked this drama but the other actors pulled their roles well too. The character Kang Yo Han has depth if you get to understand his way of thinking and method of doing things i would have loved if the plot as a whole dived a bit deeper into unraveling who this character was and less of what he stands for, he has a tragic past and suffering most "evil" character would, but he was much more than that, he never tried to justify his actions neither did he cloak it under "fighting for the greater good" shit. For me he was more human than a devil as he said "monsters aren't made, the monster inside is awoken" he strikes me in so many ways because he reminds me of a part of myself i kill to be able to associate freely, since most of my ideas and principle are considered under the minority.
The character Jung Sun Ah is a bit more cynical and unreasonable, a typical example of what an obsession can do, a strong woman fiercely guarding a set of ideas she has no opinions on, she emotional and impulsive without a care, she had no knowledge of what love and loving should be or feel like, she was well written with so much flaw that just makes sense.

Kim Ga On is a character without depth and reason, he judges and concludes whatever he can of Yo Han yet he's bent on giving infinite chances to evil and cynical people because that's he's belief, this point contradicts the principles he stands for. he's the only flaw of Kang yo Han but finding out why and how makes you realise that even if Yo Han is the devil himself he's still very much made of flesh and bones, for a judge he's more ideal than practical, a saint that's blind to all that's evil. Ga On love story is quite pathetic and slightly understandable one wouldn't trade friendship for love carelessly. Soo hyun as a character is quite weak and badly written for me she's a goody two shoes cop that has this belief of protecting Ga On innocence, diving into crisis without proper thinking i hated her at some point but later all I felt was pity she deserved more screen time for a main character.
The dialogue are quite meaningful and inspiring I like myself a real good conversation and this drama delivered steadily. The serenading classical and OST was nice.

Over all i really liked the drama with a goverment like mine the method of Yo Han would be ideal.