Last film starring Gaspard Ulliel to be released in theaters during his lifetime, and also his last film to premiere in official competition at the Cannes Film Festival. Ulliel died on January 19, 2022 following a skiing accident.
Virginie Efira and Niels Schneider who played a couple in this film, were also a couple in real life when this film was shot.
The inspiration for the title was the American miniseries Sybil (1976), based on the book of the same name by Flora Rheta Schreiber about psychoanalysis with a woman with multiple personalities. When Justine Triet started writing the script, Sibyl was the psychoanalyst instead of being the psychoanalyzed, but she had no idea that the film would have that title, it came to her at the end of the editing. Afterwards, she reversed the letters in the name and realized that now it makes sense in relation to the sibylline, hidden, mysterious, feminine side, Triet said in an interview for Le Petit Bulletin in May 2019. In Greek mythology, the Sibyls were women prophets who spoke with multiple voices.
The film was broadcast on TV for the first time in France in prime time on the channel France 2 as a tribute to Gaspard Ulliel four days after his death, on January 23, 2022. The film ranked second in ratings with 2.89 million viewers, and an audience share of 14.1%.
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