This series is a masterpiece. Though it only has 8 episode, it'll still keep you on edge until the very end. This is a must watch for those who seek for a hardcore psychological drama series. When I started the series, I actually got bored a little since the suspense was a bit slow, but as I continue watching it I just simply got hook since the development of the charas were drastically amazing, especially that they were all student. I've been watching a lot of crime mystery series now a days, and I'm not quite satisfied with the ending like on Gapdong and Hello Monster, but this series is one of the exception since its ending was terrific. I love how the writer twisted the story like that, and though it was a bit tragic, somehow it was still a happy ending with a really big bang on your consciousness and brain. So to finalize this review, I do hope that many people would watch this since it is also an eye opener not only to teenage, but also to the parents who raised them. :)