The film is titledEl ser queridoand will be directed by Sorogoyen from a screenplay he penned with Isabel Pena.
Also starring is Victoria Luengo (The Room Next Door).
International sales will be handled by Goodfellas.
Javier BardemAxelle/Bauer-Griffin/FilmMagic
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Bardem is one of Spains most famous exports.
His most recent titles includeDune: Part TwoandThe Little Mermaid.
Luengo most recently starred in Pedro Almodovars English-language debutThe Room Next Door.
Sorogoyen will be known to most for his 2022 featureThe Beasts, which won 9 Goya awards.
San Sebastian runs until September 28.
