The first draft of the script was written as a final job of a Script Class, whose teacher was writer and scholar 'Fran A. Zurián'. It was only four pages long. Although it was well received and well marked, Lorenzo Ayuso wasn't satisfied with the result, and started to rewrite it. Two years after that draft, he decided to move on to preproduction.
The film was almost entirely shot at Juan de Mairena High School in Leganés, where Lorenzo Ayuso had previously studied.
The film was supposed to be shot in April 2010, but it has to be delayed to July due to scheduling conflicts with another production of Zampanò, Night Shift (2011) by Carlos Ruano. Everyone agreed to change the filming dates, so he could have so much time to prepare the production. Finally, both directors ended up working and collaborating on each other's shooting.
At the beginning, two rhombus appear before the credits. This was the rating mark that films with adult content (sex or violence) received in Spain in the sixties and seventies.
The illustration in the wall next to the computer desk was an original design of illustrator María Emegé. It's call "Knowledge and Inspiration".