Wanna download One day you will understand. Full length movie is available here to download for free. Also, with highest quality, good speed and genuine safety. Amos Gitai’s One Day You’ll Understand , from a screenplay (in French with English subtitles) by Marie-Jose Sanselme and Amos Gitai, is based on a story by Dan Franck and Jérôme Cléments, derived from Mr. Cléments’ novel. The genesis of the film is explained in the Director’s Statement: “When I was 17, I went to Paris to spend some time with a friend of my father’s. I remember a dinner where a French historian was present.