Director Eduard Cortés was not concerned with slavishly making sure every detail was historically accurate, preferring to give things a contemporary feel in order to resonate with contemporary audiences.
In addition to being present for all the eight months of filming, series lead Irene Escolar had three months of preparation beforehand. She appears in 4,600 shots, or about 80% of the series and predicted it "will undoubtedly be one of the most exciting journeys of [her] career and [her] professional life".
An extremely ambitious project for Spain, the miniseries spent 2 years in development, after which it was filmed across 8 months in 300 locations, with 168 actors, over 3000 extras and a crew of 200 professionals.
Producer José Manuel Lorenzo spent a long time convincing author Julia Navarro, who was reluctant to let her bestselling novel be adapted for television. While she didn't write the scripts, she was closely involved with the production, reading the scripts and giving feedback.