• Thomas Chomel as Samuel "Sam" Deslandes – Victor's more responsible older brother. He has decided he wants a relationship with Romane. •
Jules Houplain as Victor Deslandes (17 years old) • Maxime Bergeron as Victor Deslandes (13 years old) – Sam's mischievous younger brother. He skipped a grade to be in the same class as the others. • Omar Mebrouk as Bilal Belkebirs (30 years old) • Timoté Rigault as Bilal Belkebirs (14 years old) – He has a secret crush on Romane. • Jade Pedri as Romane Berthauds (almost 18 years old) • Victoria Eber as Romane Berthauds (14 years old) – She is protective of her mother and her little half-sister Camille. •
Naidra Ayadi as Sofia Belkebirs – Bilal's widowed mother. She is a scientist at the research facility connected to the incident. • Guillaume Labbé as Lieutenant Retz – A police officer investigating the disappearances. • Gil Alma as Arnaud Deslandes – Sam and Victor's father. • Elise Diamant as Alice Deslandes – Sam and Victor's mother. •
Dimitri Storoge as Hervé Chassangre – Father of Romane's young half-sister Camille. He and Vanessa divorced years earlier, but he wants to reconcile. • Agnès Miguras as Vanessa Chassangre – Romane and Camille's mother. She has a serious heart condition. == Episodes ==