Sakthivel Gounder (Sarath Kumar) is a rich, influential man in his district. He has a wife (Raadhika), three sons, and a daughter. Sakthivel hates his youngest son Chinnarasu (Sarath Kumar). Sakthivel's daughter's wedding is fixed and Nandini (Devayani) is the groom's sister. She meets Chinnarasu during her brother's wedding and wonders why Sakthivel dislikes him. Chinnarasu's sidekick (Manivannan) tells a flashback to Nandini.

Chinnarasu was weak in studies from childhood. He was in love with his relative Gowri (Priya Raman) and elders decide to get them married. But Gowri is educated and she attempts suicide thinking Chinnarasu is not a perfect match for her as he is uneducated and illiterate. Chinnarasu saves Gowri and cancels the marriage proposal, but blames himself and does not reveal the truth. This angers Sakthivel, thinking that Chinnarasu did not respect his words and stopped talking to him.

Nandini gets impressed understanding Chinnarasu's kind heart and develops an affection towards him. Nandini proposes to Chinnarasu for which he does not agree. But later he too understands her true love and accepts. Both get their marriage registered, but Sakthivel gets angry knowing about this and asks the couple to vacate the home. Chinnarasu and Nandini move to a small home on the outskirts, and he secures a job in a bus transport company. With the help of Nandini's uncle (R. Sundarrajan), Chinnarasu purchases a bus and starts a transport company. Over the time, he develops his business and becomes a rich man. Also, Nandini clears civil services and gets posted as the district collector.

Sakthivel gets surprised seeing his son and daughter-in-law's growth in life. Gowri's husband (S. N. Vasanth) loses his job and she comes to meet Chinnarasu, requesting him to provide a job for which he accepts. Sakthivel meets Chinnarasu's son Sakthivel Jr. (Hemalatha) at school and develops bonding towards him. Chinnarasu gets to know this and feels happy. Sakthivel realizes his mistake of not understanding his son. Dharmalingam (Anandaraj) has rivalry against Sakthivel and plans to kill him and blame Chinnarasu. Dharmalingam adds poison to the sweet given to Sakthivel by Chinnarasu. But Sakthivel is saved, and Dharmalingam gets beaten up by the people. In the end, everyone gets united and lives as a joint family.