I watched the movie out of curiosity and this is my review. The first 2 episodes gave me high expectations and get more excited to continue watching. I was thinking Yoo Ah In is the protagonist and expect to see him until the end. But in episode 3, the first twist of the story has already been revealed through Yoo Ah In's death. Episode 3 is a spoiler of the whole movie and succeeding episodes are just to make the story longer. I continued to watch the rest of the episodes and everything doesn't make sense at all.
However, the last scene on episode 6 showed a very exciting twist, which I believe this story has season 2. Those killed by Monsters might come back to life. Viewers are given the impression that this is such a lousy one. But let's wait for it coz I have a feeling that this is not yet an ending. Until then, I still see this as a good movie.