One day, while on a photography expedition, Karthik meets a young woman named Aishwarya (played by Priya Bhavani Shankar), who is a botanist. Aishwarya is in the town to study the rare species of flowers that bloom only in that region, particularly the Mercury Pookkal, a rare and exotic flower that blooms only once a year.
Interestingly, the film gained notoriety for reportedly reuniting a real-life estranged couple, Murugan and Saraswati, who credited the movie's relatable themes for their reconciliation. Literary Connection Mercury Pookkal Tamil Movie