Remake of the Italian film Perfetti Sconosciuti - Wie viele Geheimnisse verträgt eine Freundschaft? (2016) of Paolo Genovese released in 2016.
It is his agent of Fred Cavayé who made Cavayé discover the original film. The filmmaker then changed certain characters, such as their professions and their reactions to calls or telephone messages. He also changed some other elements to make the film credible in the French context.
During the editing phase, Fred Cavayé had to cut the whole thing into mini-acts, and the director was thus making quite long shots of 4 or 5 minutes.
Filming took place from October to December 2017, in Paris.