Carlos and his girlfriend Carmen are a happy and fun couple; however, his friend León and his girlfriend Luisa are quite the opposite; so Carlos recommends León to visit the mysterious Kamus —an artist, a drunkard, a philosopher—, in the hope that he can free him from his depressing and contagious existential pessimism…
| Actor | Role |
|---|---|
| RRicardo BarojaKamus | Kamus |
| EEnrique DuránCarlos - The Optimistic | Carlos - The Optimistic |
| AAntonia FernándezCarmen | Carmen |
 Eusebio Fernández ArdavínLeón - The Pessimist | León - The Pessimist |
| GGertrudis PajaresLuisa | Luisa |
 Faustino BretañoCarmen's Father | Carmen's Father |
| FFrancisco MartíThe Rich Bald Guy | The Rich Bald Guy |
| MMaría AnayaThe Doorwoman | The Doorwoman |
| FFelipe PérezNot listed | Not listed |