Although early reports suggested that Dhanush would be the distributor, producer Vishwas Sundar, bought the distribution rights and subsequently released the film in the Diwali season of 2005.ДЄfter the films release, members of the regional censor board complained that the promos of Adhu Oru Kana Kaalam were being shown on television without mentioning that the film had an 'adult' certificate. Further trouble occurred in October 2005, Balu Mahendra approached the police seeking action to secure a sum of Rs 3.75 lakh, an outstanding amount of his salary for directing the movie, from the producer Sai Suresh and matters were resolved quickly. It became the second such film during the period, where they were forced to remove the hoardings due to public protest after Silambarasans Vallavan. In August 2005, the film faced criticism for a promotional hoarding put up in Chennai which featured photographs of Priyamani and Dhanush in a compromising position. The film was delayed through late 2004 after the director fell ill. During the making of the film, Dhanush also struck up a friendship with assistant director Vetrimaaran, and the pair have since come together for four films. He consequently also delayed his honeymoon, to commit to a fifteen-day schedule for the film in December 2004. The film was shot in Hogenakkal Falls in November 2004, with Dhanush marrying Aishwarya Rajinikanth in between schedules. The shoot for the film began in December 2003 with scenes featuring the lead pair shot in Chennai. It was later changed back to the original title before release. However he opted against doing that story and decided to build his film around two of his Malayalam films from the 1980s вЂ“ Nireekshana and Yathra, and the title of the film was subsequently changed to Unakkae Uyiranaen.

Initially the director revealed that the film titled Adhu Oru Kana Kaalam would be an extension to his 1979 film Azhiyadha Kolangal stating that Dhanush would play a teenager infatuated by a woman who is fifteen years older than him to be played by Ramya Krishnan. Whether the two join together forms the rest of the story.ДЇollowing the success of Kadhal Kondein 2003, Balu Mahendra signed on Dhanush to appear in his next film in July 2003. A dejected Srinivasan escapes from prison to meet Thulasi. His mother dies, and Thulasis family goes bankrupt and leaves to their native village in Ooty. Eventually Srinivasan gets convicted for 10-year-rigorous imprisonment. While at the police station, Srinivasan locks horns with an inmate in jail and when he pushes him in a fit of rage, he sustains a serious head injury subsequently killing him. One day, Srinivasan and his friends land up in prison for crashing their car on a police vehicle. As expected, his father objects to his son falling in love with Thulasi. Soon, he meets the maids daughter, Thulasi, his childhood playmate, and they fall in love.

When the parents leave home for a week, Srinivasan is left in the maids care. He reveals his flashback to the lorry driver, telling him of the disputes between his ambitious father and himself. Srinivasan Dhanush escapes from jail and hitches a ride on a truck to meet his love Thulasi Priyamani.

Athu oru kanaa kaalam