Sagan's charisma lies in two elements: her intelligence and sincerity. She is apt at using simple but touching words and phrases, for example, the monologue on the first page of Bonjour, Tristesse. Her legendary life, full of inspiration, enthusiasm, caprice, sometimes looks like an enigma, mysterious and compellent,even her unconventional behavior looks acceptable. Though the film seems to be a little bit insipid, or rather dull, lacking passion and elegancy;the final scene her unreal talk to his son is truly moving. Sylvie Testud's casting is admirable, and i think she wears a unique temperament, close to a temperament of a poet and aristocratic temperament.