The best K-Drama I have watched so far. The story is great and the screenplay was brilliant, with very few flaws and almost not overdone scenes. It was excellent keeping the balance between the importance of the main history, side stories and in general everything else. Each character/story has the needed amount of screen time, not more or less, which is extremely rare in not only K-dramas but also other film productions as well. As stated before, there are almost no unnecesary things at all which I never got to see in any K-Drama before. No filling side stories, no nonsense love triangles, no inconsistence at all. Main characters as the history are absolutely organic, not overdone, not plastic. All of this drama is about pain we do to others/we receive and redemption, executed perfectly by the cast. A series were the characters are not perfect but just human, characters are full of flaws. Through the entire series the characters experience an incredible development which will lead them to their resolution. The history is full of mystery, totally legit and brilliant as well. There weren't higlghy unrealistic events and each chapter keeps you more intrigued than the last until the final like no other series I have watched. It also has the sprinkle of comedy needed. The pair that played the main characters was sublime, again, nothing overdone, just real. I can't stop thinking how amazing this was. Seriously I think that I will not watch something as good as this Drama again. The only little big thing was the unnecesary mysterious final.