Antoñito is a bachelor who works in a cabaret as a clarinetist. He has put an advertisement in the newspaper, looking for a good and honest girl, and to which responds Rocío, who escapes from her native Córdoba to hide the embarrassment of her pregnancy. The coexistence with the naive clarinetist, who refuses the insinuations of a co-worker dedicated to prostitution, who idolizes his deceased mother and keeps as a relic the orthopedic leg of his late father, is not easy. The other men will tend their ties around Rocío, that makes way in the world of the spectacle pretending to be blind. When she can no longer conceal that she is pregnant, Antoñito decides to give his name to the fruit of sin.
Unfortunately the movie Corazón solitario is not yet available on HBO Max.
| Directing | Francesc Betriu | Director |
| Writing | Francesc Betriu | Writer |
| Writing | José Luis García Sánchez | Writer |
| Writing | Manuel Gutiérrez Aragón | Writer |
| Camera | José Luis Alcaine | Director of Photography |
| Sound | Carmelo Bernaola | Music |
| Production | Salvador Balcells | Executive Producer |
| Production | José Panero | Assistant Production Coordinator |
| Editing | Pablo G. del Amo | Editor |
| Art | Cristina Ballinas | Art Direction |
| Art | Benet Rossell | Art Direction |
| Production | Guillermina F. Campos | Production Secretary |
| Art | Elisa Ruiz | Set Decoration |
| Costume & Make-Up | Carmen de la Casa | Costume Design |
| Production | Jaime Fernández-Cid | Production Manager |
| Costume & Make-Up | María Nieves Ruiz | Hair Designer |
| Costume & Make-Up | Emilio Villalba | Hair Assistant |
| Costume & Make-Up | Carlos Paradela | Makeup Artist |
