Binoche plays Claire, a 50-year-old divorced teacher, who creates a 24-year-old beautiful black-haired girl on Facebook to monitor her lover Joe. But Joe only accepts friend requests from people he knows. In order to get close to Joe, Claire sends a friend request to his best friend Chris, who accepts it. Unexpectedly, after a period of chatting, Claire falls in love with Chris, and Chris also falls in love with this fictitious girl, and he asks to meet her. So Claire has to make up a busy job, a long business trip, and a very jealous ex. She can either continue to make up all kinds of lies to maintain this love without a future, or admit her deception and be prepared to lose love...