Remake of the Italian movie "Perfetti sconosciuti".
Álex de la Iglesia decided to cast Belén Rueda and Eduard Fernández as a couple after seeing how well they worked comically in La noche que mi madre mató a mi padre (2016).
For one of the couples, Álex de la Iglesia wanted a real-life actors couple, so that's why he cast Juana Acosta and Ernesto Alterio.
Very rare for an Álex de la Iglesia movie, almost all of the cast is working with him for the first time.
Beatriz Olivares was actually 29 when she played 16-17 years old Sofía. Dafne Fernández (Blanca) plays a friend of Olivares' parents and is only 2 years older than her.
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