The story revolves around a teenager from a conservative family who struggles to strike a balance between societal expectations and personal desires. According to the popular adage, Achcham (Fear), Madam (Innocence), Naanam (Coyness), Payirppu (Chastity) are the four "ideal" qualities that every good Tamil girl must possess.

A man is in a difficult position between his girlfriend who wants to marry him, and his mother who doesn't like his girlfriend.

Rajesh Shivakumar is a college hoodlum who has his first crush on Reena Joseph, who unfortunately, is engaged to be married to Rajiv Samuel, an Indian engineer settled abroad. In an effort to gain her heart, Maddy impersonates Rajiv and gets close to Reena, aided by his grandfather Subbuni and his crooked sidekick Chockalingam. However, the real Rajiv shows up, bringing a shocking end to Reena's romantic interlude.

The story, set in the backdrop of Nallore, a small town in Thoothukudi District, revolves around Sub-Inspector Durai Singam, a brave and just policeman who serves in his hometown primarily to fulfill his father’s wish. Durai Singam settles every dispute in his town patiently with his words of wisdom and resorts to force only when the situation demands it. Kavya, a city girl who comes on vacation to Nallore, falls in love with Durai Singam. Erimalai, Durai Singam's bumbling colleague and friend, often accompanies him.

Ajay (Siddharth) comes to Kasi, where his thoughts and ideas on life and death undergo a sea change after he meets a young boy. He relocates to Chennai and stays in a house owned by a couple S V S Murthy (Mouli) and Jayam (Geetha). They treat him as their own son. A do-gooder, Ajay with his jovial nature wins the heart of all those whom he comes across. Vidya (Nithya Menen), a photo journalist meets Ajay and falls for his good nature. Ajay with the help of Vidya even gets street children obtain sponsorship for their education. But things take a turn when Vidya expresses her love to Ajay. He quietly walks off the place and decides to leave Chennai. But a rude accident to Vidya puts the responsibility on Ajay's shoulders to get her back to health. He takes her to USA for a surgery. Meanwhile a flashback reveals that Ajay was a successful doctor in the United States and who led a happy life.

Small-time diamond smuggler David befriends Goa-based gangster Abbasi. But when David begins to build inroads with an international gangster, Abbasi is not happy, and soon the two turn into bitter rivals.

DCP Raghavan sets off on the trail of the killers of Rani, the daughter of a police officer. Following this, many more murders take place, leading him to New York to capture the maniac killer.

The father of twin brothers wants to get them married to only twin sisters. But one of the brothers falls in love with a woman does not have a twin sister.

College friends Jenny and Shiva part ways due to a misunderstanding. Although they are in love and realize they cannot live without each other, their egos prevent them from uniting.

Chinna and Chella, two childhood friends from neighboring families, end up falling in love with each other. Soon, a misunderstanding leads to a rift between them and their families.