Mamitha & Nivin were first choices for BKU, idea evolved even before Premalu, says writer Kiran Josey

What began as a simple idea eventually became the story of Justin and Ashley, played by Nivin Pauly and Mamitha Baiju. Justin is a man approaching middle age who is still unmarried when Ashley moves in next door. Their relationship is at the heart of the film, but it is the characters around them who give the story much of its personality.