The painting depicting the Whispering Man was exclusively painted by freelance artist Maria Marachowska.
Filmed in 4 days.
The story takes place in 2003 and 2019.
Director József Gallai asked the actors to watch Rorschach (2015) to fully understand the concept of the film.
This is the fifth collaboration between special makeup effect artist Hanna Erkel and director József Gallai, the others being Bodom (2014), Moth (2016), Echoes (2018) and Parallel (2018).