Vadivelu, a hardworking butcher, lives in a crowded slum with his 16-year-old sister Rani. His neighbour, [Selvi](/ actor/bhanupriya) (note: I will fix formatting here), let me rewrite cleanly: Selvi is deeply in love with Vadivelu and hopes to marry him, but he would only consider marriage after Rani is settled. Rani, however, is in love with Ramesh. To help Rani, Selvi hatches a plan and disguises herself as a boy who is in love with Rani, so that Ramesh would compete with the “boy” for her affection. The ruse works in reverse: Ramesh and Rani grow close, and Selvi reveals her true gender, explaining that her goal was to see Rani and Ramesh wed so she could marry Vadivelu. Yet Ramesh’s family faces a barrier—their class difference makes the match unlikely.
Meanwhile, Paramasivan, Ramesh’s father, and his driver Govindan cross paths with Selvi’s father, a struggling alcoholic who disrupts a carriage. This incident sparks tension between Vadivelu and Paramasivan. Paramasivan tries to win Vadivelu’s support in the elections by offering a bribe, but Vadivelu responds that a fair deal would require a real public project—bathrooms for their area. Paramasivan refuses and pivots to a different tactic—a school—and Vadivelu, feeling used, votes for Paramasivan’s opposite party after being bribed in return. The political maneuvering deepens their fractures, setting the stage for later loyalties to be tested in unexpected ways.
Veering deeper into domestic trouble, Paramasivan’s wife, Vadivu, hints that she has cheated and, during a tense moment in the car with Govindan, reveals that one of their children is not Paramasivan’s. The revelation sends a shockwave: Govindan crashes the car, Vadivu falls into a coma, and Paramasivan is left to uncover the truth. He pleads with Govindan not to tell anyone, while Govindan, sensing leverage, tries to use the secret to extract a pay rise.
As Ramesh and Rani marry, Paramasivan’s initial acceptance falters when Rani’s poverty becomes a sticking point, and he locks Ramesh in his room. Selvi confesses to Vadivelu that Rani has tied the knot, a revelation that inflames Vadivelu—he feels betrayed that Selvi concealed the wedding. Rani later tells Vadivelu that her in‑laws will not accept the marriage, prompting Vadivelu to visit Paramasivan with a plea to welcome his daughter‑in‑law. The visit uncovers more family history when Sekar, Ramesh’s elder brother, is revealed to be married with a son named Paramasivan. This discovery unsettles Paramasivan, who realizes that either Sekar or Ramesh might not be his biological son. The family spirals into a debate that becomes a contest for a father’s affection.
Govindan’s blunt honesty cuts through the chaos: the real test is which son truly cares for their father. Attempts to resolve the mess with fake clues and caretaking efforts fail to settle the question, and Sekar’s father‑in‑law intensifies his schemes. He attempts to poison Paramasivan and pin the blame on Ramesh, and then targets Vadivu to force a confession about the baby swap. Vadivelu intervenes during the confrontation, saving Vadivu and breaking the trap.
In a pivotal confession, Vadivu reveals that their first child was a baby girl, and to protect the daughter from rejection, someone in the delivery room swapped the baby with a boy. The truth cascades: Sekar—the eldest—was adopted, and Selvi is revealed to be Paramasivan and Vadivu’s daughter, because she bears a pendant identical to Vadivu’s. Sekar accepts the adoption and reconciles with Selvi’s adoptive father, resolving some of the long‑standing tensions.
During a Pooja festival, Paramasivan’s adversarial father‑in‑law grows desperate and plants bombs in the basket carriers. Vadivelu, acting swiftly, saves the entire family from tragedy. The attacker is finally unmasked, and the villain is arrested. In the aftermath, Vadivelu returns to Paramasivan with a simple, hopeful request: let Selvi become his wife. Paramasivan agrees, sealing the family’s future with a united, resolved bond that rises from a tapestry of secrets, loyalties, and newfound kinship. The film closes on a note of quiet triumph, with the family stepping forward together.
