The film centres on Moncho and his coming-of-age experience in Galicia in 1936. Moncho develops a close relationship with his teacher Don Gregorio who introduces the boy to different things in the world. While the story centres on Moncho's ordinary coming-of-age experiences, tensions related to the looming Spanish Civil War periodically interrupt Moncho's personal growth and daily life.
Unfortunately the movie Butterfly is not yet available on HBO Max.
| Directing | José Luis Cuerda | Director |
| Writing | Rafael Azcona | Screenplay |
| Writing | José Luis Cuerda | Screenplay |
| Writing | Manuel Rivas | Novel |
| Sound | Alejandro Amenábar | Music |
| Sound | Ricardo Steinberg | Sound Designer |
| Camera | Javier Salmones | Director of Photography |
| Editing | Ignacio Cayetano Rodríguez | Editor |
| Editing | Nacho Ruiz Capillas | Editor |
| Art | Josep Rosell i Palau | Production Design |
| Art | Balter Gallart | Set Decoration |
| Costume & Make-Up | Sonia Grande | Costume Design |
| Costume & Make-Up | Ana López-Puigcerver | Makeup Designer |
| Costume & Make-Up | Teresa Rabal | Hairstylist |
| Directing | Carmen Soriano | Script Supervisor |
| Production | Fernando Bovaira | Executive Producer |
| Production | José Luis Cuerda | Executive Producer |
| Production | Jose Maria Iresteiro | Associate Producer |
| Production | Ana Míguez | Producer's Assistant |
| Production | Emiliano Otegui | Line Producer |
| Directing | Mateo Gil | Assistant Director |
| Directing | Pedro Loro | Assistant Director |
| Directing | José Ramón Otegui | Assistant Director |
| Directing | Walter Prieto | Assistant Director |
