Director József Gallai asked the actors to watch Polytechnique (2009), Creep (2014) and Harcelée (2015) to fully understand the concept of the film.
Filmed in 10 days by a skeleton crew.
Apart from its end credits music, the film has no score at all.
The film marks the second collaboration between Elekes Pictures and Rovar Pictures, the first being Moth (2016).
Nobody from the cast and crew met Shawn Michael Clankie during filming. What's more, his scenes were filmed in Hokkaido, Japan, approximately 6000 miles from Hungary, where the production was actually located. Director József Gallai gave him instructions via Skype.