If you like a really well made story with developed characters then this is it. If you want high quality suspense, enjoy a psychological thriller, and don't mind a bit of blood then this is the drama for you. If you like stories that ask you a haunting question, this is it. I started and finished the drama in one day. It's only 8 episodes, but I'm still in a bit of shock. The pacing was perfect, the progression of the story was well done, even though it was only 8 episodes. Nothing felt rushed to too long. It was truly a well done and suspenseful story. The acting was on point. There were a few little moments where I could scrutinize, but nothing cringe worthy and nothing that was too bad (honestly, compared to some korean dramas, even the famous ones, the acting was perfect). Sometimes the sound was a bit echoey because of the set (I think they chose it because they wanted to show a big and powerful school. It makes sense but it's a pity sometimes. However, there are some moments where the echoes give a certain power to some scenes in which case the set was beneficial). The characters... wow the characters were pretty well made, especially those of the students. I really don't know how to convey how this drama was so... good. I'm a bit mad that it wasn't on dramafever or viki, but I'm glad I was able to find it. I watched it because I was looking for Bang Sung Joon. I like him a lot and decided, why not pick up another one of his things? I found this drama and decided to check it out. The story sounded interesting but... well I didn't expect it to be what I ended up finishing. It truly leaves you wondering about what is right and what is wrong, about what is natural and what is nurtured. I'm still a bit unsure how they made the story get to the point it did so... perfectly I guess. Pay attention to names in the beginning, it makes it much easier to grasp the story. I want more people to watch this, to be grabbed by this. I want others to understand what this drama is and what it does. However, this drama isn't for everyone. I had a friend who walked out several times because the story moved her so much in frustration and disgust, upset by what the story decided to do. This is a story that moves viewers like her so powerfully. If you have a high sense of morals and are easily disgusted in the wrongdoings of others and evil intentions, this might not be for you (unless despite yourself, you find yourself drawn to those kind of stories anyway). But consider how strong of an affect it had on her. I think the part that impressed me most was the acting of the main character in the end. His character development is... well when you consider it from beginning to end, it has the heaviest effect on the story... Really, that second to last scene was amazing. ugh okay I don't want to give anything away. If you're curious or you're even thinking about watching it, then do it! I found it completely worth it. I've said a couple of things in here that might dissuade people, but honestly I found this story very well done and very well worth watching. I want others to watch and appreciate this beautiful and twisted gift the creators of this show gave us. Watch it!!!!