Before the shooting begins, the director Nicolas Boukhrief asked the all crew to attend a whole week together, during a karate probation period. With the exception of himself and Albert Dupontel, the lead character, because of the bad influence that his character in the movie could have brought to the rest of the crew.
In October 2019, it was announced that Guy Ritchie would write and direct an English language remake of the film starring Jason Statham. The remake, titled Un homme en colère (2021), was released on 7 May 2021.