You've seen movie like this a lot, its still formulaic, cliché and everything. But, if it still make you wanna watch it till the end, it still got you. Wonderful Nightmare just like any movie from the same genre that tell you about some bad people who got into some other medium that will change their life forever. We know what will happen in the end, whether the main character will change or not, but we still enjoy watching their transition. I love this movie, well-crafted film making, with some experienced korean actors, nice script and everything. I totally recommend this movie for all korean cinema lover. Even for anyone who want to try some korean cinema, this one can be quite a good start. Enjoy!