It is a film called "Zezowate szczescie" (Bad Luck) in 1960 directed by Andrzej Munk, winning Golden Palm award at the Cannes Film Festival.
I was attracted by the cute boy playing Jola's fiance in the movie. He looked adorable, graceful and gorgeous in it.
I'm sorry that I have little knowledge of Polish. So I'm just wondering what the actor's name is. Anyone's help GREATLY appreciated!
You can find him on YouTube: youtube.com/watch?v=I9gcbmH1BPY
Here are several screenshots featuring him: