Nolwenn Leroy was initially set to star as Marie Bréguet, in her second acting role, but dropped out to focus on the release of her eighth album, "La Cavale".
The film went through several working titles, starting out as "L'Inconnu de Ker-Tourtan" ("The Stranger from Ker-Tourtan"), before changing to "Une Photo de Trop" ("A Picture Too Many") and then "Une Aventure à Kertanguy" ("An Adventure in Kertanguy"), which it retained until just before filming.