"The film is not about the murder case. It is inspired by an article from The Times of India titled 'No One Killed Jessica'. The article came after the accused were let off by the lower courts and then the film goes into a completely different direction, " Gupta told.
"I'd rather want everyone to wait and see where I take the film. It is not factual, it is fiction, " added the director who has scripted the film himself.
Model Jessica Lall was gunned down in a restaurant in the capital April 29, 1999 and the convict Manu Sharma is currently in Tihar Jail.
The film is being produced by UTV Motion Pictures and is set to go on the floors in February next year. The makers are planning to release it the same year.
Reluctant to shed more light on the project, the 32-year-old said he is "still in the process of casting" for the film.
A resident of Jharkhand, Gupta worked with Anurag Kashyap on "Black Friday" and "No Smoking" and also wrote the script for "Barah Anna". But he came into the limelight with his hard-hitting directorial debut "Aamir". The Rajeev Khandelwal- starrer left audiences and critics applauding.