Nash starts having dreams from his student years. After graduation, he eventually becomes paranoid schizophrenic, but he does not realize that he is ill. The chain of events changes when he suddenly appears in front of a psychiatrist during a conference. He is hospitalized and therefore distracted from his academic studies.

When his illness reaches the point where it will cause him to harm his own child, his wife thinks that he should go to the hospital again. Although he cannot accept that he has been ill for a long time, he realizes that the girl he sees constantly has never grown up. This allows him to accept his illness. Nash will try to live with them, ignoring the imaginary realities he is experiencing. Although the treatments he has undergone are not effective, he starts everything again with the support of his wife and former colleagues. By reining in his own mental illness with his own mind, he accelerates his academic studies again. He starts teaching at the university again. In the end, he continues his life with schizophrenia with an unusual struggle he shows. And history presents this amazing genius with the Nobel Prize in Economics for defeating mental illness again with his mind, devoting the rest of his life to science and for the discoveries he made before the onset of his illness.