I watched this because of Yoo Seungho and Kang Sora actually but the title is "4th period murder mystery" well I hate murder story cause it maybe scary but I then decided to watched this. So I think the story is great actually. But when it's like almost ended the story is not so good anymore I can say it's bad actually. It's unexpected but I think it's TOO unexpected so I think the storyline is too quick .___. I love the cast and acting, it's funny and little romance. Well a little thriller too but still good acting :) I can't really remember the music but I think it goes well with the movie so I should say it's good I wouldn't rewatch it cause I don't think it's really worth rewatch but maybe I will rewatch too see Yoo Seungho /shot nah. I think it's quite worth rewatch :) Overall I enjoy the movie and I think if you want to watch this you should. Oh and if you are scared because it maybe scary.. No it's not scary so you should watch this :)