Jilted on his wedding day, Laurent, a stage actor playing the role of the famous seducer Don Juan, cannot help but see his ex-fiancée in every women he meets. In an attempt to mend his broken heart and ego, he tries to seduce them all but none are receptive to his elaborate (and musical) advances. Meanwhile, at the theater, the leading lady quits and the production brings in Laurent’s ex-fiancée as the replacement.
Because he forgot his identity card, Elias cannot take the entrance exam to Sciences Po. In search of a job while waiting to be able to take the exam again, he becomes an educator in a children's home. Confronted with an environment he doesn't know how to work, Elias doesn't yet know how much this experience will change his life.