The movie is based on Indian Revolutionary Shaheed Sardar Udham Singh who is better known for the assassination of Michael O Dwyer in London, who was behind the Jallianwala Bagh Massacre.
They fascinated me, Bhagat Singh and Sardar Udham. I thought that in Sardar Udham, I can marry the two. What they think, who they are. Intellectually, Udham Singh was influenced by Ghadar movement.