Léa Faber is a young modern, attractive and ambitious business woman. When she learns that her telecommunications company will soon pass into the hands of a new boss, Léa exults: the promotion is at hand. However, as she goes to the inauguration cocktail, she discovers that the new CEO is none other than Lecamp-Latour, a sinister man, renowned for his moral rigidity, his misogyny and his attachment to traditional values. In fact, Léa embodies everything he despises. Obliged to adapt to the quarter turn, Léa sets her sights on a man encountered by chance: she asks the pianist hired for the evening, Yann Le Guenn, to camp the role of her fiancé. The latter is an ex-cynical and disenchanted astrophysicist, a divorced and indebted father, coupled with a talented musician. Faced with the distress of Léa, Yann nevertheless agrees without reluctant to play the Transis lovers for a few hours. Things get complicated when Lecamp-Latour invites Léa and Yann to a weekend in her country house. To still corp the situation, Benoît, ex-friend and rival of Léa, is also there. If Yann is opposed to the masquerade, he ends up giving in, for finance. While Léa fell asleep from the pianist, Yann, well determined not to get her heart to break, gives her a hard time ... Their duo will cause sparks.