Parvin meets a young man named Jalal Agha-Balakhan on the street and takes him to his friend Azar's birthday party. Jalal, who is a mechanic, introduces himself as a engineer Omidvar. Parvin also pretends that his father is a police colonel. Azar is also interested in Jalal; But soon Bahram, Azar's friend, seeing Jalal in the mechanical workshop, doubts Jalal's job and social status and discusses ...