The film is narrated from Aisha's viewpoint which Priyanka believes makes it more special.
"The moments of joy, moments of tragedy--all of that together from the perspective of this teenager. I just think the juxtaposition of the movie--telling the story about a dying young girl, but showing the celebration of her life, instead of the mourning of her death--was so clever," Deadline quoted the actor as saying during the Festival.
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The idea of the movie struck director Shonali Bose when she first met the parents of late child activist Aisha Chaudhary, who is the main character in the story.
But more than that, Sonali shares a more personal connect to the film.
"Death is something universal. I lost my son, and was able to embrace that pain of that and accept it, and come to peace with it, and actually find almost a beauty and joy in it," said the filmmaker.
"I celebrate his death days as much as I celebrate his birthdays, or anybody's birthdays," Shonali added.
The forthcoming film slated to open on October 11 this year also stars Farhan Akhtar and Zaira Wasim.
The film is based on the life of Aisha, who became a motivational speaker after being diagnosed with an immune deficiency order at the age of 13. It also sheds light on the love story of her parents.
It is co-produced by Priyanka, Ronnie Screwvala and Siddharth Roy Kapur, and will hit the big screens on October 11.