If you've been a fan of singer Kumar Sanu, and still hum the string of songs he lent his voice to in the 90s, here's more reasons for you to rejoice. Ayushmann Khurrana's film Dum Laga Ke Haisha, in which Sanu has sung Dard Karara, could well be the comeback film of sorts for Sanu. Sharat Kataria, the director of the film, says Sanu was always important for his film. "Kumar Sanu was always a part of the script. Those who grew up in the 90s can never forget the value of Kumar Sanu’s voice in their lives. It's not just about his voice in the film. Even the story has references about him."