Currency and Peace(1988)

Original title: Bony a klid

Martin is an innocent lad from small-town Mlada Boleslav who comes to big-city Prague, hoping to exchange his krona for deutschemarks so that he can visit Germany. A local spiv named Robert obliges Martin, but at an unfair exchange rate. When Martin finds out he was rooked, he plans revenge on Robert ... but then decides to join Robert's gang instead.