This is a psychological thriller with hitchcockian undertones. I'm stunned by how original and interesting this is. Capturing. The writer and director have achieved an amazing series. I guess pychological dramas are not everyone's piece of cake (comparing to likewise low ratings of Cheese In the Trap) but this is definitely amongst all time top serious k-dramas for me. It's offering a lot of food for thought. I don't think the descriptions the drama or its themes do any justice to it - jealousy and vengeance are too superficial ideas/drivers and this drama is much more deep and layered to be described in those terms. If something, it tells that some people just don't seem to have the gift for happiness. Looking for another person to deliver all the goods things in life is a doomed mission. Happiness is a choice as much as anything else. The writer would deserve the award this year, that much is already clear. All the actors are great in their roles. There is no overacting . I was always wondering why didn't we hear more of the Leo in "Black". Here he is now, maybe still starting but starting good. Poor Kim Bo Yun always has these roles as the obnoxious mother - she's good but I'd like to see her in the "good mother" role for a change :)