I think this drama is fairly talked about drama, but watching the movie remake it made me realize, this drama needed more explanation for the viewers. They really took Hae Jin's character and tried to normalize a sociopathic man. I felt incredibly uncomfortable watching anything "romantic" for Sol. Kang Joon played a key role in the drama, giving us a breather away from Hae Jin's characters decisions and actions. This drama was good overall, because you're interested to find what Jin's character will do next, but the ending is strange and incomplete. It sets up that a sociopath can be good, instead of showing that people who suffer from these tendencies need to seek help. Overall, it's a well-made drama, but this writing has serious real-world consequences.