There hasn't been a drama quite like this one in my long journey with Korean dramas. The deep psychoanalysis of love, hate, fear, trust, betrayal, and most importantly: is evil bred or innate? This drama constantly questions nature vs nurture of evil in this drama and gives multiple answers. I like how the drama is able to keep this question relatively open ended and leaves the answer for the audience to choose. The storyline is very well written. I absolutely love almost all the inner monologues spoken by the characters. Notably, there is really no "minor" character. Each character in the cast has their own back story. Despite only having eight episodes, almost all the characters in the cast were fleshed out and their inner psyche fully explored. I have to give the writer props for being able to maintain such a large main cast while still being able to develop all of them so well. Overall, definitely give this drama a go if you enjoy exploring the human psyche and like mysteries. Be warned, this drama is dark and does not provide all the answers tied together in a nice bow. Go in there with an open mind and strong heart because most likely you will be shocked multiple times throughout the drama as I was.