One of the best Korean crime thrillers I have seen. The movie that made me become hooked to Korean movies in the first place. If you like the concept of going back in time (in this case, one year) and the butterfly effect, this is your movie. All though a lot of time-switch movies are difficult to follow, this one is not. 5 years later the Korean "The Call" was released, in the same genre. Also, and maybe even better.
