"The storyline was very unconventional and when I approached a star with the script, he liked it, but had some apprehensions about it and after that I realised that no star would agree to do this film," Sircar said.
"It was then that I decided, I shall have a complete fresh cast and crew for this film," Sircar said at a talk at Whistling Woods International, Mumbai.
The film, based on sperm donation, also featured newcomer Yami Gautam.
"Ayushmann was an easy pick but we auditioned a lot for the female lead," said Sircar.
"I run a theatre group in Delhi called Act1 and Ayushmann and Yami were trained in acting there for three months and I also took workshops with them for 15 days," he added.