Easy!
Scialla! (Stai sereno) (original)
The life of a melancholy professor is turned upside down when he discovers that a rebellious teenager he is tutoring is actually his son.
Starring Fabrizio Bentivoglio, Barbora Bobuľová, Vinicio Marchioni, Filippo Scicchitano, Raffaella Lebboroni, Arianna Scommegna, Paola Tiziana Cruciani, Giacomo Ceccarelli, Giuseppe Guarino, Prince Chidozie Manujibeya
It's a comedy movie, and has a rating of 6.6 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from United States.