Based on the book by Domenico Starnone

Pietro Vella, who works in a rundown Roman high school, strongly believes that he can help students strive for a better future. Teresa, a bright and rebellious student, is totally taken with him and his lessons. Then, a few years later, they meet up again and get romantically entangled. Teresa insists they must share their deepest secrets to bond for life. But as soon as Pietro really opens up, the relationship ends.