It's 2-hour movie, totally worth it though. I would recommend it to anyone who's interested in mystery, action, drama and psychological genres. Everyone's acting was top notch, I honestly couldn't find any fault in it. Every character in this story was portrayed beautifully, whether it was creepy, vicious or kind. The movie showcases its point in the nature vs nurture debate. One other reason I liked the film was because I could connect with all the main and support characters, it really was a well-written script. Usually, the bad guys are just plain bad guys, but not in this one. Here, we see each person has their own part to play, to further the story, to complete a group's dynamics or to help in another character's development. And I could empathize both with our 'hero' (Hwayi) and with the 'bad guys'.