In this new series, Le Jour où tout a basculé (The Day When Everything Turned Upside Down), a mother and son's close relationship is about to change. Enzo, who lives with his mother Murielle, runs into a man with a distinctive tattoo. Determined to track down the man, whom he believes to be his father, he starts an inquiry of his own despite his mother's skepticism.

Enzo is convinced a man with a thorny rose tattoo is his father. He can't wait to share his discovery with his mother, but she claims it's not possible: because of his shady past, his father can't be in the country. But Enzo doesn't want to believe her....

Enzo's mother finally admits that she knew of his father's whereabouts and asks for Enzo's forgiveness for keeping it a secret. Enzo is still in shock and not ready to forgive her. He's following another lead, a young woman who may eventually take him to his real father.

Enzo unexpectedly meets his father for the first time at Angèle's house. Feeling extremely awkward, he cuts short his visit with Angèle, who, of course, doesn't understand. She later reveals her true feelings for Enzo, who recoils when she tries to kiss him. Angèle storms off, hurt and mystified.

Enzo meets Angèle's dad Brice again and seizes the opportunity to take a picture of him by pretending to admire his tattoo. His hopes of finding his real father are dashed when he shows his mother the photograph, and she doesn't recognize the face. The only bright spot in all this is that Angèle may not be his sister after all.

Enzo ruined his chances with Angèle, and their budding romance is shattered. Angèle feels totally betrayed as she learns the real reason of his pursuit: the search for his father.

Enzo has not heard from Angèle since the fiasco of his last visit, but he does hear from Brice, who contacts him unexpectedly to share stories about his father. Enzo finds out that Brice used to be a very close friend of his father's, and Enzo is thrilled to gather some information at last.

Enzo could not be happier. At last, he is reunited with his father, and his sister!