Sachein (Vijay), a carefree and happy going guy joins a college in Ooty and falls for Shalini (Genelia) immediately on seeing her in first sight. Shalini studies in the same college as Sachein and is considered a popular and beautiful student, while also being a short tempered and arrogant girl with an upper-middle class status. Sachein comes to know all of this information about her from Arnold aka Ayyasamy (Vadivelu), who is a guy that studies in the college for about nine years and keeps studying there because he thinks that students should give their respect to their college professors, while also informing Sachein, that there are so many boys trying to impress her. This makes Sachein take a different route and he starts mocking Shalini in front of her, which irritates her. Slowly, they both become good friends, after Sachein saved her father in a bike accident. Santhanam (N. Santhanam), who is another student in the college also loves Shalini. But, he feels jealous seeing her and Sachein being good friends and decides to separate them. Santhanam writes in one of the walls of the college, that Sachein loves Shalini and this angers Shalini, as she misunderstands that only Sachein has done it. Shalini shouts at Sachein, but Sachein informs Shalini, that he is so outspoken and does not want to write in the college wall to convey his love, which makes Shalini realize her mistake.
But to her surprise, Sachein informs that, although he has not written it, but the content present on the wall is true which means that he is in love with Shalini. This again angers Shalini and she shouts at him that she considered him only as a good friend and that she wasn’t in love with him. Later, Shalini overhears Sachein challenging Santhanam that Shalini will convey her love within the next thirty days, as their college years will be completed by then. Shalini challenges Sachein that she will never fall in love with him.
Manju (Bipasha Basu) is also from the same college and she likes Sachein. Shalini gets jealous when she spots Sachein and Manju together often. But Manju informs Shalini that Sachein loves Shalini so much and asks her not to hide her feelings, as it is very evident that Shalini too likes Sachein. This makes Shalini realize her love towards Sachein. Sachein comes to know that Shalini’s parents have arranged a wedding for her and he meets Shalini on the last day of their college and says that he has lost the challenge and he will be leaving Ooty tomorrow. But Shalini hides her feelings towards Sachein and she plans to propose her love the next day as she wants to win the challenge by not conveying her love within the 30 days.
On the 31st day, Shalini is excited and goes to propose Sachein. But suddenly, she meets Gowtham (Raghuvaran) on the way, who is Sachein’s father. Gowtham is a billionaire, in which this fact makes the entire college be surprised that Sachein is the only son of a rich business tycoon, as Sachein always stays very simple and down to earth. Now Shalini feels bad, that if she proposes her love towards Sachein at this moment, then he might misunderstand that she decided to marry him after knowing that he is so rich and decides to stay calm. Sachein leaves to the Coimbatore International Airport in Coimbatore and Shalini also follows him. In the airport, Shalini could not control her emotions and proposes to Sachein. She also revealed that it is her ego that didn’t let her convey her love during the last thirty days. Sachein feels so happy and the couple are united.

The movie begins with two kids who fight with each other in a marriage hall. They meet after two decades, now Krishna (Prasanna) and Ramya (Laila) during a college cultural meet and again lock horns with each other. Fate brings them together in Chennai after a few years, again fighting with each other. Meanwhile, a series of events forces Krishna’s close friend Aravindh (Karthik Kumar) to come to India from the USA to get married. His parents arrange his wedding with Ramya. Ramya, who decides to get married to help her younger sister’s love, displays herself as a passive character who accepts whatever the life partner feel is right. On the contrary, she is bold, active, independent and assertive in nature. Knowing this, Krishna tries hard to let her true character come out. However, Aravindh stalls the wedding plans and returns to the USA as he finds Ramya as a person who does not think on her own and not independent. Mistaking Krishna for influencing Aravindh, Ramya locks horns with him.

Bala (Gemini Ganesan) and Bhanu (Jayanthi) are a happily married couple. Everything seems fine till Sheela (Vanisri) enters their lives. Bala is a tennis champion and Sheela claims to be his fan. The family members raise objection to this liaison but Bhanu trusts her husband blindly. Bala takes undue advantage of this trust and continues to meet Sheela on the sly till one day Bhanu stumbles upon the truth. This breach of trust breaks Bhanu which eventually leads to her death. An unrepentant Bala takes this as an opportunity and proposes to marry Sheela. His mother is shattered but gives in to his demands. An elated Bala rushes to Sheela only to find her missing! Was it poetic justice?

The film begins with a trio of friends in college (Malar, Mona, Gayathri). Mona falls in love with Karthik (Shiv Pandit) despite the advice of Malar (Manasi Parekh Gohil) who suspects Karthik to be a complete flirt. One day, while on a date, Mona mentions to Karthik, Malar’s views about him and this gets Karthik to start disliking Malar for interfering in his love life. When Karthik calls Mona, Malar picks the call up accidentally and they get into an argument with Karthik venting out his anger towards her interfering in his love life. Shortly later, he breaks up with Mona. Gayathri believing Mona was a wrong choice in Karthik’s life begins to date Karthik, while Malar is firmly against it. The relationship ends the same way as his relationship with Mona. A year or two later both Karthik and Malar work at the same software company on different floors in the same building. One day, while trying to call his friend on Malar’s floor, he accidentally calls Malar and the two realize their identities and presence in the building and the age-old feud resumes. Over lunch, both Malar’s friend (Vicky) and his own friend (Suja) advise him to sort it with Malar. Vicky questions why Karthik would fight with such a beautiful woman as Malar. Karthik not knowing what Malar looks like decides to take a look at her. When he sees Malar he falls in love at first sight, he then tries to reconcile with Malar, but Malar is not willing to forgive a flirt like Karthik. Karthik becomes desperate and begins to follow Malar and in a chance meeting orchestrated by Karthik he introduces himself as a sweet and kind person by the name of ‘Sundar’. Malar who has never met Karthik face to face, believes his false identity and begins to open up to Sundar.

Rajesh goes to jail for killing his second wife. Meanwhile, his son grows up among the local goons and establishes himself as a full-fledged rowdy. Rajesh wants him to get married but he hates women.

The romantic comedy stars Vishnu and Catherine Tresa as a loving couple. Vishnu’s character faces a problem, however, as he has to try hard to win the approval of his girlfriend’s father.

Aadhavan (Suriya) is a professional assassin working with his father Ibrahim Rowther (Sayaji Shinde) and brother Tharani (Anand Babu). Doctor Abdul Kulkarni(Rahul Dev) hires Aadhavan to kill prominent Judge Subramaniam (Murali), since he is handling the inquiry and verdict on Abdul’s child kidnapping, murder and organ trafficking cases in Kolkata.

Panni Kutty (aka) Panni Kutti is a Tamil comedy movie directed and edited by Anucharan Murugaiyan, the movie produced by Subaskaran under the banner Lyca Productions.

Pandian and Pandiarajan are two notorious sons of the village cinema theater owner V. K. Ramasamy. Pandian goes to a neighbouring village to see a girl as arranged by his father towards his marriage and ends up in the wrong house. Coincidentally, those in the wrong house are also expecting a lad to see their daughter on the same time and the same day. Contrary to real time arranged marriages, Pandian goes to see the girl totally un-aided by parents, relatives and friends. Nevertheless, he takes a liking to the girl, Seetha and decides to marry her. Seetha likes the lad and decides to accept the proposal.

Meanwhile, Seetha’s marriage broker shows up and clarifies that Pandian was supposed to have gone to see some other girl but ended up in the wrong house. Hearing this, Pandian, Seetha and Seetha’s parents seem disappointed. Pandian’s father fixes dates for her marriage to the girl originally chosen for him — Revathi, a school teacher’s daughter. Pandian’s adamance to marry Seetha causes a strange turn of events. Pandiyarajan, the younger brother, finally marries Revathi while Pandian ties the knot with this love Seetha.

Sanju (Sundeep Kishan) is a college going student who falls for a girl Tanvi (Regina Cassandra) at first sight. They get along over a period of time but unsure of the advancing in their relationship because other person might not be perfect.

The descendants of two men who betrayed a royal family centuries ago are caught up in events that involve ghosts, revenge and kidnapping.