The young boy who plays with Antoine is not Guillaumet as a child; it is François de Saint-Exupéry, Antoine's brother, who died young. Antoine de Saint-Exupéry and Henri Guillaumet were not childhood friends.
Louis Garrel and Vincent Cassel previously appeared in Mon roi (2015), Les Trois Mousquetaires : D'Artagnan (2023) and Les Trois Mousquetaires: Milady (2023).
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