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 – 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.
A dejected Srinivasan escapes from prison to meet Thulasi.
His mother dies, and Thulasi's 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 maid's daughter, Thulasi, his childhood playmate, and they fall in love. When the parents leave home for a week, Srinivasan is left in the maid's 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).