This story especially the ending really surprise me, in the beginning, i'm a little bored, but that's still make me want to watch the next episode. I have never thought that all scenes in the beginning that make me bored is closely related to the storyline. If you are pay attention to details, that's really creepy and make curious. We will be brought into the truth by flowing like water, the one is very scary is when My mentality is also drained like Jongwoo's role here, I get carried away and even affect the real world. Its cool. and i've never thought the ending. the one that makes me hurt so much is when "they're" will kill Seok Yun, It hurt my heart when he begging Jeongwoo please. you have to watch this, you won't regret it. the scene is certainly gruesome, but it's very cool. Once I once even supported the main leader, the handsome dentist. don't forget to watch its only 10 ep, I finished it only one day