Sujoy won the award for Best Original Screenplay for 'Kahaani' that was announced today. Best Editing award went to Namrata Rao for the same film, while a special jury award was given to actor Nawazuddin Siddiqui.
"I am very much happy winning the award. It is a huge honour. I am still trying to absorb that we have won the award.
The feeling is yet to sink in," Sujoy told PTI.
Vidya Balan starrer 'Kahaani' has swept several awards earlier across various categories.
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"I had not expected that we could get national award for the film. As this time the competition was quite tough...There were lot of other good films made last year. We did not hope to win it," Sujoy said.
In the film, Vidya played the role of a a seven-month pregnant woman who came to Kolkata from London in search of her missing husband. With nothing to rely on except fragments from her memories about him, it is a story of a lone woman's relentless struggle in an unknown city.
"Now 'Kahaani 2' has to be a huge...Big film. And I will make it only when we have a really good script in place. Till we are not sure and satisfied about the storyline we will not go ahead," Sujoy said.
After two back-to-back flops in 'Home Delivery' and 'Aladin', Ghosh tested success with the Vidya Balan-starrer 'Kahaani' last year. He made his Bollywood debut in 2003 through 'Jhankaar Beats'.