Although Jean-Louis Trintignant has been retired since 2003, he only comes back to working on films if Michael Haneke is directing. He considers Haneke the greatest director alive and would act for him in any film (in both big and smalls roles). Michael Haneke also considers Trintignant one of his all time favorite actors (along with Marlon Brando).
Just like in Amour (2012), Jean-Louis Trintignant and Isabelle Huppert also play father and daughter.
In the works of Michael Haneke, the motive for the murder of a relative out of compassion is periodically encountered, and this is no accident. Once, his aunt, who was terminally ill, turned to him with a request for euthanasia.