It is a very warm story of a drug addict who at the same time is a passionate non conformist history/PE teacher at a high school in Brooklyn.
His everyday struggles seem to only affect him outside of the classroom. And the classroom seems to be the only environment where he is in control of everything happening around him. His students love him him being a fair assessor of their knowledge who clearly enjoys working with them as well.
Ryan Gosling is convincing as a complex character and this certainly is one of the most interesting roles in his career so far.