I don't usually like to say this but having read some of the 1* reviews some people don't understand this movie. We get all the backstories we need and all the motivations are displayed clearly if you read into the movie.
This film is a masterclass in subtly, very little backstory wise is outright said, yet is all there. Slowic is compelling and understandable to some extent.
In short, watch this if you have the chance but be ready to think.