Tamilazhagan, a stage artist, lives a simple life with his sister's family. One day, he's approached by wealthy brothers Ragupathy, Gajapathy, and Seethapathy, asking him to pretend as Tamilarasan, a long-lost heir returned from abroad, aiming to gain control over Janaki's valuable estate. Janaki, their sister, is in a coma with no memory. Tamilazhagan agrees and takes on Tamilarasan's identity, unaware of their true intentions. But Lawyer Balasubramaniam suspects foul play and sends Pachaiyappa to investigate. Tamilazhagan, sensing something's off, escapes the estate, seeking honest work. He becomes a loader at a factory where his brother-in-law is a supervisor, unaware that it belongs to the brothers he escaped. He clashes with Duriyodhanan, who threatens labourers, taking part of their wages. Tamilazhagan fights Duriyodhanan's goons, earning co-workers' respect. Gajapathy's daughter, Vimala, meets Tamilazhagan at a cloth store, and after a comical encounter, she falls in love with him, admiring his character. Learning he's their factory worker, she saves him from losing his job. The brothers face a deadline: find Tamilazhagan within 30 days, or the properties go to the government. Meanwhile, Tamilazhagan helps a friend by pretending to be his rich father to aid his marriage. At the wedding, Pachaiyappa suspects Tamilazhagan, pretending as the friend's father, is the escaped Tamilarasan. Tamilazhagan escapes Pachaiyappa and the police by dressing as
Shiva. While escaping, Tamilazhagan enters a house, sees Janaki's photo, and faints, reminded of his past. Balasubramaniam rescues him, suspecting he's the real Tamilarasan, Janaki's biological son. With a doctor's help, Balasubramaniam uncovers Tamilarasan's traumatic past. The greedy brothers beat Janaki, forcing young Tamilarasan to consume poison, threatening to kill her. Janaki falls mentally ill, seeing her son's fate. Ragupathy orders the disposal of Tamilarasan's corpse; Gajapathy throws him off a cliff. A young girl and her father rescue him, finding him alive. Tamilarasan loses his memory due to poison, growing up as Tamilazhagan, the girl's adopted brother. Upon recovery, Tamilarasan learns his maternal uncles are trying to loot his rightful property. To avenge them for his mother's condition, he reenters the estate with Balasubramaniam's help. Using his Tamilazhagan identity, he gains their trust. Balasubramaniam instructs him to find his father's killer, keeping his adopted sister's family secret, citing safety concerns. Tamilarasan meets his mother, but lies about being an orphan to Ragupathy's inquiry. He hides the truth from his adopted sister and Vimala, who's shocked to see Tamilazhagan as Tamilarasan. Tamilarasan maintains the ruse, portraying himself as two individuals to earn Vimala and her cousins' trust. Vimala tactically gets Tamilarasan arrested, but with Balasubramaniam's support, he appears in two places, making Vimala believe they're different individuals. However, Tamilarasan confesses to Vimala that he's acting as Tamilazhagan to safeguard his property and mother. Realizing the cause, Vimala joins him. As part of the plan, Tamilarasan visits the factory, shocking his adopted sister's husband and friends, who think Tamilazhagan is cheating. Tamilarasan verbally accuses his maternal uncles of looting, with Vimala shouting that they don't need his property. They tear and burn the forged factory documents, foiling the greedy brothers' scheme. Tamilarasan's cold behaviour towards his adopted sister's husband makes the family decide to leave town, but Tamilarasan stops them, revealing the truth with Balasubramaniam's help. Ragupathy suspects Tamilarasan, beating his adopted sister's family, threatening them, and learning Tamilarasan's impersonation. Tamilarasan re-enacts his childhood trauma before Janaki, restoring her memory. She reveals her brothers killed her husband, staging it as an accident, threatening her to remain silent or kill young Tamilarasan. Learning the truth, Tamilarasan seeks revenge, asking Janaki to pretend her memory isn't cured. The maternal uncles, learning Tamilarasan's true identity, pretend ignorance, playing along. On the day of property transfer, Ragupathy reveals he's aware of Tamilarasan's impersonation, having installed bombs with Duriyodhanan's help to ruin the property. Tamilarasan rushes to save factory workers, leading to a road chase, blocked by Duriyodhanan. Tamilarasan rescues his adopted niece, who is hung from a helicopter, killing Ragupathy's and Gajapathy's sons. He fights Duriyodhanan, pushing him into the fire, stopping the bomb, and evacuating workers. The maternal uncles are arrested for their crimes. Tamilarasan reunites with his mother and adopted sister's family, marrying Vimala. He transfers properties to his adopted sister's family, choosing to work as a labourer, satisfied with his decision. == Cast ==