I got a question for you: Once Upon a Time in Mumbaai is a 2010 Indian gangster film written by Rajat Arora, directed by Milan Luthria and produced by Ekta Kapoor. It stars Ajay Devgn, Emraan Hashmi, Kangana Ranaut, Prachi Desai and Randeep Hooda. The film is produced under Balaji Motion Pictures and released on 30 July 2010. Once Upon A Time in Mumbaai received generally positive reviews from critics and was a box office success. The film is loosely based on the lives of Mumbai underworld gangsters Haji Mastan and Dawood Ibrahim.\n\nOnce upon a time in mumbaai based on whose story?
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To answer the question, consider the following: The film is loosely based on the lives of Mumbai underworld gangsters Haji Mastan and Dawood Ibrahim.
Therefore, the answer is Mumbai underworld gangsters Haji Mastan and Dawood Ibrahim.
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