Param Sundari is a romantic comedy that narrates the story of Param (Sidharth Malhotra), a Delhi-based heir to a wealthy businessman (Sanjay Kapoor), who is on a restless search for both the right business idea and true love. Despite trying multiple ventures and start-ups, Param has never tasted success. One day, his friend Shekhar (Abhishek Banerjee) approaches him with a proposal to invest in his dating app, convinced it will revolutionize how youngsters find their partners. Curious, Param tests the app himself and gets matched with Sundari (Janhvi Kapoor), a simple girl from a village in Kerala. To see if the app really works, he decides to stay at Sundari’s homestay. His father, however, sets a condition—Param must find a match within a month before he commits to the investment. Param arrives in Kerala with his best friend Jaggi (Manjot Singh). Though he and Sundari clash at first, they gradually grow closer. Just as love begins to blossom, an unexpected twist threatens to derail their journey together.