Which fantasy movie of the or where star was suspected insanity cause he had imagination who believed its true?

In the fantasy movie "A Beautiful Mind", Russell Crowe plays John Nash, a mathematician who is diagnosed with schizophrenia and is suspected of insanity. Despite this, he is able to continue his work and eventually win the Nobel Prize in Economics. Throughout the movie, Nash struggles to distinguish between his hallucinations and reality, and his friends and colleagues must decide whether to believe in his work or commit him to a mental institution.