Two poor children swear an oath: one will study, the other will work and support them both. The worker turns to crime...
| Directing | Fernando Méndez | Director |
| Writing | Fernando Méndez | Writer |
| Writing | Ramón Obón | Writer |
| Writing | Roberto Romaña | Writer |
| Production | Antonio del Castillo | Producer |
| Sound | Sergio Guerrero | Music |
| Camera | Raúl Martínez Solares | Director of Photography |
| Editing | Rafael Ceballos | Editor |
| Art | Ramón Rodríguez Granada | Production Design |
| Art | José G. Jara | Set Decoration |
| Costume & Make-Up | Julio Chávez | Costume Design |
| Camera | Cirilo Rodríguez | Camera Operator |
| Editing | Eufemio Rivera | Assistant Editor |
| Crew | José Silva | Choreographer |