'Azhagana Naalgal' was announced with Karthik and Simran. Simran had excitedly spoken about how she was finally getting to play the lead with her favourite hero Karthik. It would have been their first pairing and some scenes were shot too. Then for some unavoidable reasons, like the industry strike, etc., the entire shooting schedule went haywire. And when finally the shooting did start again, Simran's dates were difficult to get. Now the heroine has been changed and it is Rambha who is playing the lead role opposite Karthik. The script has been slightly altered to suit her image, and the earlier portions shot with Simran have been scrapped. Mumtaz gets to play a crucial role. Two songs were shot on Rambha & Karthik in Ooty and some scenes were shot at the film city, Hyderabad. Taking part in the shooting were Karthik, Mumtaz, Rajiv, Manivannan, and Delhi Ganesh.

Rajasekhar and Somasundaram are close friends. They decide to strengthen their friendship further by getting Rajasekhar's younger son Chandru married to Rekha, Somasundaram’s daughter. While Somasundaram wonders if Chandru would agree to the marriage, Gunasekhar, Rajasekhar's elder son takes it on himself to convince his brother. Chandru is at first reluctant, since he had just started his new business. But heeding to his brother's coaxing, finally agrees. An overjoyed Gunasekhar tells the good news to his father and Somasundaram. Rekha, who overhears the whole thing, is overwhelmed with joy and fantasises about Chandru in a 'dream' song. 

Directing the artistes was Sunder C., while M. Prasad canned the shots. Playing the two friends Somasundaram and Rajasekhar were Delhi Ganesh and Manivannan respectively. Karthik played Chandru and elder brother Gunasekhar was played by Rajiv. Mumtaz played Rekha.

The supporting cast consists of Goundamani, Senthil, Sabita Anand, Dalapathy Dinesh, Ponnambalam, and Anu Mohan. Pandiarajan plays an important character in the film. The film is produced by Selvan, who has been an art director for the past 18 years, and the banner is called Gautami Arts. Deva scores the music and G.K. designs the sets, while Sai Suresh edits the film.

Says the director about his film, "A normal human being has a life span of about 2,40,000 days. Out of these he spends just a few days on matters of the heart. Those few days he spends on 'love' would be his 'Azhagana Naalgal'.