 Demy started as a young actor in Agnès Varda's films "L'une chante, l'autre pas" ("One Sings, the Other Doesn't"), "Documenteur", "Mur Murs" and "Kung Fu Master".Demy's work as an actor ranges from romantic comedy to drama.His breakthrough came in 1998, when he was cast as Olivier, a young man with AIDS, in the musical "Jeanne et le Garçon formidable", directed by Olivier Ducastel and Jacques Martineau.