The Manzoni High School in Milan is the worst in Italy. When the percentage of those promoted falls to 12%, it's time for the last resort: to entrust the classes to the worst of the available teachers.

Italian airship engineer Umberto Nobile enjoys a quiet life with his beloved dog Titina. One day, Norwegian explorer superstar Roald Amundsen contacts him and orders an airship to conquer The North Pole.

All unemployed, Ki-taek's family takes peculiar interest in the wealthy and glamorous Parks for their livelihood until they get entangled in an unexpected incident.

Though Kevin has evidenced 23 personalities to his trusted psychiatrist, Dr. Fletcher, there remains one still submerged who is set to materialize and dominate all the others. Compelled to abduct three teenage girls led by the willful, observant Casey, Kevin reaches a war for survival among all of those contained within him — as well as everyone around him — as the walls between his compartments shatter apart.

Thirteen-year-olds Léo and Rémi have always been close, but they drift apart after the intimacy of their relationship is questioned by schoolmates.