The aspect of innocence lost is sometimes based in the context of ignorance. The original "Exorcist" painted in the lines of the proponent of purity versus the conservative nature possibly of the church. With "The Exorcist: Believer", the filmmakers try to take a similar approach but with not enough narrative backbone and delivery to create the stakes.

The texture of Korean horror is pushing elements beyond their breaking point in being both uncomfortable but mythic and cautionary in a certain way. "Metamorphosis" is a play on that idiom but it leans a lot on the basis of "The Exorcist".