At first, I was planning to watch this because of some reasons: 1- Yeo Jin Goo is in the main role, 2-It is a thriller movie but Jin Goo was just 15 in this movie. (I wondered how he is affected from the movie, because he was too young.) And actually I hadn't cared about this movie when I saw it for the first time, thanks to Circle (Jin Goo is in the main role) I got the curiosity to watch this. Anyways, I watched the trailer yesterday and I even couldn't breathe because of the thrilling and scary aura of it. So I downloaded it yesterday and watched it today. Although the plot's course made me say "OH, GOD, NO!" until the ending, it was a really different story unlike what I used to see in most of movies. The plot was really an original work and I am now applauding whoever this movie's story maker. I even cried in some scenes and couldn't breathe in most of the scenes. I also specify that I am not a person who cries or gets affected because of a movie/drama/book. I wished there were a novel of this movie... It reminded me the Japanese novel (and also there is a movie of it) that is called "Confessions" somehow. I guess it's because Hwayi is also too young like Shuuya and Naoki, and also he is connected to the crime world just like them, but in a bit different way. Except these, the characters (especially that crazy detective) were interesting as well. Actors did a really great job, a 15-year-old actor proved his talent in this movie also. The effects and flow of the movie were really impressive, there was nothing that is unnecessary, the makers used the time of the movie so greatly and they didn't make a thing like "waste of time scene", they used every second to satisfy the watchers. I am not a person who watches or reads a movie/drama/book over and over again if I liked it. However, if I was a person like that, I really would do it. So if you are so, you would watch this movie thousands of times I think. For the last, you really have to watch this movie, I really recommend it so much!