The story is narrated by ten-year old Staszek, who writes in his diary about his school-friend Jozef. Jozef comes from a family of blacksmiths, all of whom bear the name Jozef. Since he is the sixth consecutive son to be called Jozef, he is nicknamed Szustek (meaning "sixth one").

• Komitet Kinematografii
• Krzysztof Majchrzak
• Bartosz Opania
• Grażyna Błęcka-Kolska
• Mariusz Saniternik
• Maria Gładkowska
• Jan Nowicki
• Franciszek Pieczka
• Izabella Bukowska