With an idea to lead a peaceful life, the friends create a false fight among them and then migrate to Chennai with their families. They settle down there as neighbours living in the opposite houses. When Prabhu-Urvashi's son Aari and Thennavan-Sriranjani's daughter Maya reach their adulthood, the elders want to unite them in marriage. They feel that this proposal would put an end to their family feud. Though the youngsters are at loggerheads initially, love blossoms between the two after a while.
In this situation, the relatives of both the families entangle in a new clash and come to Chennai to seek support from Prabhu and Thennavan respectively. Prabhu's relatives kidnap Thennavan and take him to their village. They convey this message to Prabhu and make him to come to their place to settle the issue. When the relatives insist the friends to take on each other, what happens after that and the happy result are narrated in the rest of the story.
Having taken up a different character from his previous movies, hero Aari has proved his talents. Heroine Maya has portrayed her character in a great manner. It is interesting to see them clash most of the time instead of doing romance. Prabhu, Urvashi, Thennavan-Sriranjani combination add strength to the movie. Experienced actors like Mansoor Ali Khan, Manobala and M.S.Baskar have done their portions perfectly.
Producer Abirami Ramanathan has written this comedy based story and R.K has directed this family entertainer. But, there is nothing much to laugh due to lack of hilarious sequences in Unnodu Ka.
Songs are enjoyable and the BGMs are excellent with Sathya's music composition. Sakthi Saravanan's cinematography gets a word of appreciation especially in the village shots.