This is clearly not great. The premise of this movie is dumb and it tries to be both Train to Bsan and the Exorcist and fails at both. William does a fine job, but everyone else is struggling to pull their weight. The effects are substandard, the cinematography and sound design lacking, direction is sloppy, and the overall casting is not fantastic. Some money has been put into this, so it doesn't look like an absolute train wreck, but it is really not a good movie.