This film was shot from back to front, so it would be easier on lead actor Filip Peeters. He lost around 60 pounds by only drinking liquid foods for a few months, and could then gain weight throughout the shoot. He said it was very awkward to play a very worn out person (as his character Marcel van Loock was at the end of the movie), when you've just started shooting.
The real-life Marcel van Loock, on interviews with whom this movie is based, attended the premiere in Brussels. After the movie was over, he emotionally collapsed and needed to be left in peace for about twenty minutes.