| Director | Atlee |
|---|---|
| Genre | action film |
| Country | India |
| Budget | ₹120 crore |
| Box office | ₹250 crore |
A series of abductions of medical staff occurs at dawn: an ambulance driver, a medical broker, a hospital worker, and a surgeon. The abductions are traced to Maaran. Maaran is arrested and interrogated by DCP Ratnavel "Randy".
A flashback reveals that Maaran is a doctor, who takes only 5 rupees for treatment, and has a huge following in his home city of Chennai, leading to him receiving an award in Paris from Dr. Arjun Zachariah.
During his days in Paris, Maaran is also shown to be a magician. He meets Pallavi, a doctor from India and Arjun Zachariah's assistant, and they soon fall in love. He soon conducts a magic show in Paris, in which he kills Arjun Zachariah. This case is being investigated by DCP Ratnavel "Randy". Daniel Arokiaraj, another corrupt doctor, arrives at the scene of the murder, threatening Randy to find who killed his friend. Maaran comes back to Chennai. He soon meets Tara, a news reporter, and they fall in love.
In the present, Maaran reveals the reasons for the abductions. Maaran explains that the four were responsible for the death of an auto driver's daughter and the suicide of his wife due to their greed for money and negligence in providing proper healthcare. He then gives Randy the locations of his hostages but asserts that if they reach the hospital in time, they will survive, like the auto driver's daughter. However, the police find them dead.
Back to the past, Daniel sees Maaran's inexpensive healthcare as a threat to his hospital business. He decides to kill Maaran using his goons. That night, Maaran is beaten up by goons, but is saved by his doppelgänger Vetri. It is then disclosed that the crimes were committed by Vetri, proving that the magician (Vetri) and the doctor (Maaran) are different people. In the present, the person arrested is Vetri, who had kidnapped Maaran after rescuing him. He escapes using his magic tricks, while Maaran is rescued at that same time.
Vetri and Pallavi soon reconcile. Meanwhile, Maaran's family and girlfriend Tara, are kidnapped by Daniel, who demands and asks him for Vetri. Randy and his assistant then interrogate Salim Ghosh, a famous magician, who is revealed to be Vetri's father. Soon that same night, Maaran finds Vetri's hideout and confronts both Vetri and Vadivu. He constantly demands to know who Vetri is, prompting Vadivu to intervene and tell Maaran about his real identity.
Past: Maaran and Vetri are the sons of Aishwarya "Aishu" and Vetrimaaran, an altruistic village wrestler and chieftain in the 1970s. Vetrimaaran builds a temple in his area and holds a grand festive event. However, a fire breaks out, injuring many and killing two children. On the advice of Aishu, Vetrimaaran establishes a hospital in his village, appointing Daniel and Arjun as the chief doctors under the assumption that they are good-hearted. However, it's soon revealed that Daniel and Arjun are money-minded misanthropists and perform a Caesarean section on Aishu when she is in labour with her second child (Vetri) to extract more money from Vetrimaaran, though the child could undergo a normal delivery
With an overdose of anaesthesia and loss of blood, Aishu dies while the child is declared stillborn. When Vetrimaaran learns about this, he is enraged that they deceived them and tries to confront Daniel. During the confrontation at the hospital, Maaran is struck by a glass bottle, falls unconscious, and loses his memory. Vetrimaaran, though under attack himself, manages to place Maaran safely in a truck before Daniel's men throw the seemingly stillborn Vetri into a dump. Vetrimaaran fights Daniel's henchmen while gravely injured but gets stabbed by Daniel who reveals that he only caused the fire accident and Vetrimaaran swears that he will pay for the misdeeds before dying. However, just before dying, he amputates the arm of Daniel's henchman, Kasi. Daniel and Arjun embezzle money from the medical services to consolidate their dictatorship over the years. Soon, Vetri miraculously survives, and their paternal uncle, Vadivu, takes care of him. Salim Ghosh then adopts Vetri and Vadivu who found them when he returned home after his magic show performance in Dindigul. Vetri soon learns all the magic tricks from Salim Ghosh to exact vengeance. Maaran is found by Sarala who adopted him.
Present: Upon learning about his past, Maaran reconciles with Vetri, and they swap places. Vetri (who is Maaran) is in custody, and Daniel meets him in prison and contemplates misusing the medical industry for his gains. Meanwhile, Daniel's nephew, Sesha, tries to make a deal with Maaran (revealed to be Vetri) to shut down his practice. However, when they both learn the truth, Vetri slits Sesha's hand. Daniel rushes to Vetri's hideout, where Vetri defeats his henchmen and injures Daniel. Though Vetri is critically wounded in the process and nearly dies, Maaran revives him via CPR. However, Maaran revives Vetri via CPR. In a fight, Maaran kills Kasi, and Vetri brutally electrocutes Daniel, killing him. Later, the police arrest Vetri for his role in the murders. Before leaving, Vetri gives a press conference justifying his actions by exposing corrupt medical practices and the embezzlement of money in the field. Maaran becomes the head of the Indian Medical Council. One day in prison, Vetri watches a news report in which, despite his efforts, another young girl dies from medical negligence. On hearing this, Vetri escapes using his magic tricks and continues his mission.