Raghunandhan is a rich but unhappy businessman based in Madrid. He wishes to reconcile with his estranged daughter Nandhini, whom he expelled because she married Prakash against his wishes. His grandson Aadhi promises Raghunandan that he will bring her back to their home on his 80th birthday. Nandhini has two daughters: Maya and Priya. Aadhi enters the house as a driver named Raja who was appointed by Prakash after saving him from a heart attack. Raja tries to woo Priya but gives up when he learns that she is in love with another man. Maya hates Raja and is suspicious of him. Nandhini later reveals to Raja that she is aware of his real identity much before the incidents and warns him to abstain from doing anything with the intention of taking her back to Raghunandan.

To save Priya's love, Raja and Bucket, Nandhini and Prakash's manager, go to a village, and accidentally, Maya falls into the jeep due to a head injury, thus suffering with amnesia. Raja introduces himself as her lover for the time being. Maya believes it. The trio goes to the venue. Raja and Bucket enter the house. They and the bridegroom escape from there and reach Nandhini's home after a violent altercation with the family members of the bridegroom where Maya's memory is revived. The bride's father Pandithurai asks for compensation for the damage caused by Raja, to which Nandhini promises Maya's marriage with Pandithurai's second son Saravanan. To avoid complications, Prakash fires Raja. Raja later learns that Maya loved him from the beginning but was hesitant to express her feelings.

Azhagu, Pandithurai’s eldest son, falls for Maya, but his attempts are repeatedly thwarted by Raja. On the day of her marriage, Maya elopes with Raja. While waiting with him for the train to Coimbatore, Pandithurai's men reach the station to stop them, only to be trashed by Raja and his assistants, led by Roshan. Through Roshan, Maya discovers Raja’s real motive. An angry Prakash, with Nandhini, arrives to shoot Raja, but Prakash is taken aback after knowing his true identity as Aadhi. Aadhi reveals that the day Nandhini left the house, Raghunandan tried to commit suicide but accidentally killed Aadhi’s mother. He says that he chose to love his grandfather, though he killed his mother. Nandhini chose to hate him, as he injured Prakash and expelled them.

Nandhini and Prakash realise their folly and reconcile with Aadhi. Maya is kidnapped by four henchmen appointed by Azhagu, where she narrates the story to the henchmen. Aadhi and Bucket reach the spot, and Maya reconciles with Raja. Pandithurai is arrested. Raghunandan reconciles with Nandhini, and Aadhi is unanimously appointed as the CEO of the company thanks to Raghunandan and Nandhini's support. The film ends with Aadhi holding Raghunandan's hand with affection.