Who Is This That I Love?

Who Is This That I Love? (Wer bist du, den ich liebe?) is a 1950 West German musical comedy film directed by Géza von Bolváry and starring Jester Naefe, Adrian Hoven, and Iván Petrovich. It was shot at the Wiesbaden and Bavaria Studios and on location around Lake Starnberg. The film's sets were designed by the art directors Fritz Lück and Hans Sohnle.

Synopsis
when her father dies, Beatrix decides to collect the gambling debts from his former card playing partners. However several try and plead poverty to try and get out of their obligations, but she is very persistent. She meets and likes Franz, the student son of one of the debtors who she believes is penniless. In fact he is very wealthy, and a sophisticated fortune hunter Livia has her eyes on him. Beatrix sets out to thwart Livia and secure Franz for herself.