There was nothing to suggest that the paths of Magalie and Guillaume should cross. Yet this is what happens when Monique and André, Magalie's mother and Guillaume's father, newly in love, organize a dinner to which their offspring is invited. Guillaume falls in love with Magalie, this unexpected “half-sister”. Magalie is in a relationship, but too bad: Guillaume wants to see her again so much that he entrusts her with the project of renovating the kitchen of his suburban bungalow. A relationship as ambiguous as it is sincere is established between them, but will Magalie be ready to accept Guillaume's love?