The series was created by Aitor Gabilondo and David Bermejo and is based on a story by writer Manuel Rivas, addressing the past and present of drug trafficking in Galicia.

The series was filmed entirely in Galicia and its coast, creating the fictional region of Oeste, with locations such as Pazo da Toxeiriña in Moraña, Arosa Island, Villagarcía de Arosa, the port of Vigo, Santiago de Compostela and the port of Ribeira.

The first episode premiered simultaneously on five channels of the Mediaset España group (Telecinco, FDF, Energy, Divinity and Be Mad), achieving a combined audience share of 22.3% with 3,047,000 viewers.

During the broadcast of the second episode of the second season, on January 23, 2020, it was revealed in advertising that this would be the final season of the series.

The second season premiered in full on Netflix on January 31, 2020, when Telecinco had only aired 3 episodes of that season.

In its broadcast on Telecinco, the first episodes were accompanied by reports related to drug trafficking in the Galician estuaries, such as 'The Narcos Who Lived from the Sea' and 'Spain Looks at Mecca'.

In March 2022, the development of an Italian remake for Canale 5 titled 'Il Patriarca', directed by and starring Claudio Amendola, was announced.