Meera is in a college and pregnant nearing labour. Here, she tells her story of how she got to this point in a flashback.

During a walk to the park Raghuraman (Prakash Raj) meets Sudhakar (Prithviraj Sukumaran) and tells him about daughter Abhi (Trisha Krishnan). Raghuraman is the loving husband of Anu (Aishwarya Sivachandran) and the worrisome as well as caring father of his only daughter Abhi. Together they live a calm and content life in Ooty. Also living with them is “Ravi Shastri” (Elango Kumaravel) who was earlier a beggar and was adopted by Abhi. Raghuraman and Abhi are best friends. Over the years as Abhi grows up, Raghuraman has the joy of being a part of her life. When Abhi gets accepted in a prestigious college in New Delhi, Raghuraman is shocked. Although the thought of being separated from his daughter for two whole years is heartbreaking, Raghuraman wearily accepts. After returning from college, Abhi tells her parents that she has fallen in love with a young man in Delhi. Anu is perfectly all right with the idea, but Raghuraman is angry and scared. He shouts at Abi and does not talk to her properly. Anu later informs Raghuraman that their future son-in-law will be arriving by flight and staying with them for a while. As soon as Raghuraman meets his future son-in-law, Joginder Singh (Ganesh Venkatraman), he is taken aback because Joginder is a Sikh. After many conflicts with Abhi and Anu, Raghuraman finally realizes that Joginder is self-sacrificing and quite talented, more so when on one occasion the Prime Minister calls him for advice.

Kalidasa (Prakash Rai) works in the state archaeological department and is a food lover, he is 45 years old and remains unmarried. His only companion is his cook, Krishna (Thambi Ramaiah). Naveen (Tejus) is Kalidasa’s nephew who comes to stay with him while looking for a job. Kalidasa has a normal life until he gets a misdialed phone call from Gowri (Sneha), a dubbing artiste living with her friend Meghana (Samyukta Hornad). Gowri rings to order a Dosa from a restaurant, but gets Kalidasa instead. Their conversations do not go well at first, but a long-distance romance develops due to their common interest—cooking and food. Kalidasa is a born gourmet while Gowri is indulging in culinary activities in memory of her dead mother. Kalidasa starts to let Gowri into the secrets of baking with a multi-layered cake called “Joan’s Rainbow”.
Kalidasa and Gowri both get the jitters before their first face-to-face meeting, as each becomes conscious of their own physical appearances, and both decide to send younger and better looking substitutes instead, Naveen and Meghana. When they meet, neither Naveen nor Meghana realises that the other person is a substitute, since they introduce themselves as Kalidasa and Gowri respectively. Naveen thinks that Kalidasa is actually in love with Meghana while Meghana thinks that Gowri is in love with Naveen. They attempt to sabotage their older counterpart’s relationship by telling Kalidasa and Gowri respectively that the person they met would be unsuitable for them due to huge age difference and personality type. Kalidasa and Gowri try to forget each other and end up feeling sad for a long duration of the movie. Finally, Kalidas gives in to his loneliness and calls up Gowri and they both decide to meet face to face. Both of them decide to meet each other honestly to get it over with. Naveen and Meghana, who by this time had started to develop feelings for each other, are confused worried upon hearing this as they are afraid their true identity will be revealed to the other person. Naveen finally admits to Meghana that he is not the real Kalidasa and Meghana too explains her side of the story. They both realise the confusion and call Kalidasa to apologise and narrate all the incidents unknown to them. Kalidasa and Gowri finally meet each other at the planned museum and their relationship begins.

Sunil (Prabhu Deva) is one of the leading heart surgeons in the country. He lives with Ganpat (Mouli), who is also a doctor and is loved by everyone in the family. Sunitha (Jaya Seal) arrives with a kid who has a heart problem to the hospital. But she is shocked seeing Sunil there and lashes out when she learns he is the doctor who is about to treat the kid.
The movie goes for a flashback. Sunil’s brother Balaram (Sarathkumar) is a thug but does not want his brother to follow his footsteps, therefore sends him away to study. Sunitha and Sunil are classmates in a medical college and they both fall in love. Sunil expresses his wish of marrying Sunitha to Bala, for which he accepts. Meanwhile, Sunitha goes back to her village for her sister’s child’s ear piercing ceremony. Her sister’s husband is money-minded and tries to get Sunitha married to a rich man in return for money.

Veerabhagu, a powerful don, disapproves of his daughter Anjali’s relationship with Guru. He tries several ways to keep them away from each other.

Kuselan, a rich man, who has nine children, wants to see them married before his death. Hence, he announces large-scale interviews with the dowry of one crore for the chosen suitors.

Vetrimaaran IPS is a young and dedicated cop posted as the Assistant Commissioner of Police in Chennai, where he lives with his parents and his brother. A seemingly innocuous case of a missing woman he is assigned to, evolves to become a double murder case. Though the investigation leads him to meet his soulmate, the case gets murkier by the day. The situation get out of hand when his own family gets embroiled in the mix and he is pushed against time to decode the mystery.

Sridhar (Tarun) is a final year degree student and gets selected in the campus selections for studies abroad. He goes to Mumbai for an interview and in his return finds Preeti (Trisha) and loses his heart to her. Sridhar comes to know that Preeti was about to join in degree and Preeti learns that he was a final year degree student. Sridhar is an ardent cricket fan, so is Preeti, while Sridhar is also a good football player. The principal of the college appoints a coach called Reshma (Shriya), who is also a student, for the football team led by Sridhar. Sridhar tries his best to trace Preeti by visiting several women’s colleges, while Preeti also watches for Sridhar at the men’s college. Accidentally, Preeti helps Sridhar’s mother, when she had a heart attack. In order to find Preeti at any cost, Sridhar goes to the LB Stadium, where a cricket match is in progress and gets injuries in a bomb blast in the stadium. Just before the blast, both Preeti and Sridhar find each other but could not meet due to the blast.