Mehra started developing the project as a personal story rather than a sports film, taking the theme of "zindagi se bhago nahin, zindagi ke saath bhago" ("don't run away from life, run with life"), depicting his life from 13 to 28 years. Milkha Singh (20 November 1929 - 18 June 2021), also known as "The Flying Sikh", was an Indian track and field sprinter who was introduced to the sport while serving in the Indian Army. He is the only athlete to win gold at 400 metres at the Asian Games as well as the Commonwealth Games. Partition of India in 1947 caused chaos which resulted in mass religious violence in Punjab in British India, killing the parents of Milkha Singh (Farhan Akhtar). He reaches Delhi and later meets his sister there. Living in impoverished refugee camps, Milkha soon makes friends and survives by stealing with his friends.