Marta, a maid at the boarding house run by her aunt Doña Laura, prevents the lodger Elena from committing suicide over the writer Arturo, who has proposed that they live together instead of getting married. Arturo then tries to seduce another lodger, the piano student Claudia, unaware that she is Elena’s younger sister. Claudia is not deceived by him, so he sets his sights on yet another lodger, the model Sara, during a party hosted by the elderly Requena, one of her suitors.
| Actor | Role |
|---|---|
 Rosario GranadosElena Estrada | Elena Estrada |
 Carmen MontejoMarta | Marta |
 MiroslavaClaudia | Claudia |
 Víctor JuncoArturo Varela | Arturo Varela |
 Fanny SchillerDoña Laura | Doña Laura |
 Rafael AlcaydeMauricio Licona | Mauricio Licona |
| EEduardo SegovianoTestigo | Testigo |
| MMario ForastieriAgente policía | Agente policía |
 Gloria LozanoSara Moncayo | Sara Moncayo |
| DDaniel ArroyoAmigo de Gustavo (uncredited) | Amigo de Gustavo (uncredited) |
 Freddy Fernández 'El Pichi'Botones (uncredited) | Botones (uncredited) |
| HHéctor MateosInvitado baile (uncredited) | Invitado baile (uncredited) |
| CConsuelo MúgicaChismosa baile (uncredited) | Chismosa baile (uncredited) |
 José Ortiz de ZárateGustavo Requena (uncredited) | Gustavo Requena (uncredited) |
| IIgnacio PeónInvitado club (uncredited) | Invitado club (uncredited) |