Fact1: henchmen of Rangan works for local MLA Mariappa, Fact2: Sathya 's life changes as he With invokes wrath of Rangan incident, Fact3: Rangan and men humiliate Sudha forcing Sathya to thrash Rangan and destroy bar, Fact4: he and friends start taking law into own hands thrashing anyone, Fact5: Dhandapani convinces him to move to own house and work
Output: Sathyamurthy alias Sathya Kamal Haasan is an unemployed youth who does not tolerate injustice anywhere. He stays with his father Mudaliar Bahadoor, stepmother Vadivukkarasi and stepsister Sudha. One day Sathya beats up a group of ruffians who are thrashing a tea vendor for not paying extortion taxes. These ruffians are the henchmen of a local goon Rangan, who works for the local MLA Mariappa Rajesh. With this incident, Sathyas life changes as he invokes the wrath of Rangan. In retribution, Rangan and his men humiliate Sudha in public, forcing Sathya to thrash Rangan and destroy his bar. Meanwhile, Sathya falls in love with Geetha Nair Amala Akkineni, a young Malayali woman who works as a salesperson in a cloth shop. Soon, Sathya begins to grab public attention, as he and his friends start taking the law into their own hands, thrashing anyone who tries to break the law and harass innocents. Mariappa also gets to know of Sathya and thinks that he is working for his archrival Dhandapani Kitty, who is a social reformer. He orders that Sathya and his friends be eliminated. Mariappas gang attack and kill one of Sathyas friends Sundar in full public view. Though Sathya tries his best, no one comes forward to give witness to the murder out of fear, because of which the murderers are released. Frustrated, Sathya thrashes the murderers on their release, leading to his arrest, but is later released on bail by Dhandapani. Soon, Sathyas family disowns him for his activities, following which he is approached by Dhandapani, who convinces him to move to his own house and work for him. With the help of Dhandapani, he manages to get Sudha married to her boyfriend Anand, who is the local police inspector, saves the marriage of his other stepsister by paying the dowry of unk20,000 and also ensuring that his fathers employer Kavithalaya Krishnan treats his father with respect. Finally, Dhandapani tells Sathya to get some secret files and documents against Mariappa, which can be used to expose him in public. Risking his life, Sathya gets a hold of the files. Now the film takes a twist as Sathya comes to known that Dhandapani is a corrupt person and doublecrosser who used the evidence against Mariappa to join hands with him and contest the upcoming election in his place, and none of the evidence collected has been published anywhere. Sathya also finds out that his services are no longer needed by Dhandapani, and he is thrown out of his house. Enraged and betrayed, Sathya barges into a political meeting where Mariappa and Dhandapani are present and tries to expose Dhandapani, but is forced out and thrashed by the workers of Mariappas political party. Undaunted, he sneaks into Dhandapanis house a few days later and takes the file containing evidence of both Mariappas and Dhandapanis illegal activities. While on the run from Dhandapanis henchmen, he gets shot and seriously injured, but manages to survive. However, the evidence against Mariappa and Dhandapani is destroyed as Sathya used the file as a shield against the gunshots. Sathya escapes from hospital, confronts Mariappa and Dhandapani and kills them both.