Mama und der Millionär (2005)

The single mother Leonie has great worries: Since her ex-boyfriend left her a huge debt mountain, knows the young cosmetics saleswoman hardly how to make a living. In her distress, Leonie decides to catch a millionaire. She is on the verge of falling in love with her new colleague Oliver. What Leonie does not suspect: The alleged temporary worker is in truth no less than the son of her employer - and thus a "real" millionaire

Unfortunately the movie Mama und der Millionär is not yet available on HBO Max.