Pandian, a lovable yet struggling stuntman, is devastated when his affluent, snobbish father-in-law, Chachapathy, successfully grants a divorce to Pandian’s
estranged wife, Janaki, due to his unstable career. Crucially, the court grants Janaki custody of their beloved young daughter, Bharati. Desperate to remain close to his child, Pandian enlists his loyal friend and make-up artist, Mudaliar, to hatch an elaborate, high-stakes deception.Pandian transforms into "Avvai Shanmugi," a genteel, elderly Brahmin female cook. He applies for the newly vacated nanny position at Janaki’s household, driven solely by the desperate yearning to care for and be near Bharati. Initially skeptical, Janaki and her household are quickly won over by Shanmugi’s culinary wizardry, old-world charm, and fierce devotion to Bharati.Complications swiftly multiply when Chachapathy, a notorious womanizer, instantly becomes infatuated with the mature and witty Shanmugi, relentlessly pursuing her with awkward romantic advances. Pandian must constantly navigate this bizarre harassment while maintaining his dual persona. Simultaneously, Janaki’s brooding boss, John Rose—a man harboring secret affections for Janaki—also enters the domestic sphere, adding further romantic tension and jealousy to the household dynamics.As days pass, Pandian finds himself deeply conflicted. While he is overjoyed to secretly bond with his daughter and subtly support Janaki, the emotional toll of the masquerade grows heavier. He longs to drop the facade and reclaim his rightful place as a husband and father, yet fears that revealing the truth will permanently shatter Janaki’s trust and drive her further away.The chaotic web of lies finally unravels during a high-society function. Through a series of frantic mishaps, mistaken identities, and slapstick interventions, the truth about Shanmugi’s true identity is dramatically exposed to the entire family. Janaki is initially furious and deeply hurt by the elaborate deception, feeling profoundly manipulated. However, the raw emotion behind Pandian’s actions cannot be ignored. Witnessing the genuine, unbreakable bond he shares with Bharati, and realizing the immense lengths he went to just to be near his family, Janaki’s anger slowly thaws. The household is forced to confront the deeper fissures in their relationships. Ultimately, the shared trials dismantle Chachapathy’s snobbery and clear the air of past misunderstandings, paving the way for reconciliation. Janaki recognizes the depth of Pandian's love, leading to a heartwarming
family reunion where Pandian, Janaki, and Bharati are finally restored as a happy, unbroken family unit.