20/18

The filmmakers were unable to get permission from the South Korean government to film in the actual hospital, so scenes in the film set in Gonjiam were actually filmed in the National Maritime High School in Busan, with the production team adhering closely to the floor plan of the hospital to recreate exactly the same exterior and hallways

Chronology

The filmmakers were unable to get permission from the South Korean government to film in the actual hospital, so scenes in the film set in Gonjiam were actually filmed in the National Maritime High School in Busan, with the production team adhering closely to the floor plan of the hospital to recreate exactly the same exterior and hallways..

She is obviously responding as she smiles at whoever it is

Charlotte keeps looking to the side when the group is in front of the hospital.

References Return to House on Haunted Hill (2007)

If you're a fan of scary B movies, the scares are amazing on the second half.

I enjoyed watching it when everything rolled out

I really hate the blacking out/glitching effect the movie did.