This comedy is about one average family. The father works as master in the factory and his son is studying on high school. One day father must start to visit the evening school. It's the same school as his son visiting. The lives both students are connecting together. The son must teach the math and physics his own father. The father getting to know, that the life of the students is not simple as he supposed.
| Actor | Role |
|---|---|
 Jiří SovákKroupa sr. | Kroupa sr. |
 Míla MyslíkováKroupová | Kroupová |
 Jiří SchmitzerKroupa jr. | Kroupa jr. |
 Václav LohniskýHujer | Hujer |
 Iva JanžurováTýfová | Týfová |
 Josef KemrPlha | Plha |
 Ladislav SmoljakTuček | Tuček |
 Zdeněk SvěrákŠlajs | Šlajs |
 František Kováříkprof. Hrbolek | prof. Hrbolek |
 Josef AbrhámUčitel Janda | Učitel Janda |
 Taťjana MedveckáEva Tůmová | Eva Tůmová |
 Jan SkopečekNot listed | Not listed |
 Milena DvorskáNot listed | Not listed |
 Marie Motlovásvačinářka | svačinářka |
 Jaroslava ObermaierováNot listed | Not listed |
 František Filipovskýprof. chemie Lapáček | prof. chemie Lapáček |
 Jiří Hálekředitel školy | ředitel školy |
 Petr NárožnýIng.Týfa | Ing.Týfa |
 Jaroslav WeigelRousek | Rousek |
 Petr BruknerNot listed | Not listed |
| VVladimír HrabánekNot listed | Not listed |
 Pavel VondruškaNot listed | Not listed |
 Jiří LírNot listed | Not listed |
 Zdeněk SrstkaNot listed | Not listed |
 Libuše ŠvormováNot listed | Not listed |
 Vladimír HrubýNot listed | Not listed |
 Václav TréglNot listed | Not listed |
 Oldřich VelenNot listed | Not listed |
 Darja HajskáNot listed | Not listed |
 Roman ČadaNot listed | Not listed |