Long time ago, I didn't see a great exorcism movie.
When I watched the trailer, I thought that could be a bad movie, with a lot discrepancies between the believes and the catholic religion, and also I didn't liked watch to Park Seo Jeon as priest and a fighter, that's give me a bad feeling.

But the temptation was a lot, so, I decided saw it and.... WAS ONE OF THE BEST MOVIES, could be my second favorite after The Priest.
How they show the messages of God, how the role of Park live the same things that all the Catholics suffer, because we don't understand why God do what He do; and later, how God gives to Yong Hoo a power, not for he comeback to the church, but to heal his heart from all the hate and remember him that perhaps our loved ones not are present in body, but if in our hearts, and always they are with us.
This movie show perfect, that the agnostics don't exist, all believe in God, just don't like that He didn’t do what they wanted.