Thanks to Cedric Klapisch, Arthur who is still in his thirties gets to meet his 70-year old son! Yes, anything is possible in movies, love and war.
Arthur's (Romain Duris) girl-friend Lucie (Geraldine Pailhas), on the night of the 31st december 1999, decides to start the new year with starting a family of her very own. She requests her boy-friend Arthur to impregnate her with his baby. However Arthur, finds himself not prepared for this leap to fatherhood.
Later, while ruminating the subject, he finds himself transported to the year 2070 and comes to a face-off with his future son, Ako (Jean-Paul Belmondo). This 70-year old son shows him his house, family and life. Arthur is also let to see the plight of Paris in 2070. Ako convinces his father to give him his life before the moment passes.