Main character "Nick" is based on the director's son Nico, who had the same disease. Movie is dedicated to him, as he passed away in 2021.
Outlaw Wilson is modeled after the late actor Lee Van Cleef, who usually played villains in several spaghetti westerns.
Based in the short movie "Cuerdas" from the same director.
Story is based on the real-life sibling bond between co-director Pedro Solís García's daughter Alejandra and his son Nicolás, who was also born with cerebral palsy and couldn't speak.
At the first version of the screenplay, Nick character was talking, but Pedro Solís García was against this idea: "No, no, no, this cannot be. My kid didn't speak. You have to write a character that speaks with his eyes." Then the film's co-screenwriter and producer Jordi Gasull did some research, talked with Pedro about his son and watched Nico's videos to rewrite the script without Nick talking and showed them to Pedro. "Now, this is my son" - he said.