The film starts in a court where the divorce case was going and Janaki(Meena) was fighting for divorce from Pandian(Kamal) as she feels that she could continue her marriage life as she was not able to come to terms with living in a small house with no amenities and also Kamal is not able to spend much of the time with her as he runs a Dance school and also a choreographer in film industry. Finally Meena wins the case as the court agrees to give divorce. According to this verdict Pandian can meet her daughter Bharathi every Friday and that too in a public Place. So Pandian meets her daughter every Friday in a temple. But Bharathi wants to live with her father rather than mother. After some days Pandian sees and advertisement in a newspaper that Vishwanathan Iyer was in search of a servant maid who can also takes care of his granddaughter. After seeing this advertisement she calls him and speaks in a lady voice and when Vishwanathan Iyer asks for her name he first struggles and later he sees the street name as Avvai Shanmugan Street and says his name as Avvai Shanmugi. Then he goes to Nagesh and asks for his help. Nagesh accepted his offer for 20,000 rupees and he assured him that he could change him as old lady with the help of his Make up techniques. For this Pandian sells his bike and gives the money to him but still there is a shortage of money. Finally Pandian becomes Avvai Shanmugi and he goes for the interview in a Ladies bus, but Nagesh says that he make up stays only for 5 hours. Then he (Pandian as Avvai Shanmugi) goes to the house for the interview, where he finds that interview was already over and they asked all theothers to leave. During that time Bharathi, Pandian's daughter, meets with an accdient due fire as she was burning crackers and seeing this Pandian saves her. Watching these activities of Pandian,Vishwanathan Iyer immediately appoints Avvai Shanmugi. There Avvai Shanmugi was recognized by Bharathi and she finds and says that it was not Shanmugi but his father. Then lot of activities takes place there and Avvai Shanmugi and his daughter finds and shows Vishwanathan Iyer the different types of theft going on in the house with the help of Senthurama Iyer and the cook. As Avvai Shanumi resembles the wife of Vishwanathan Iyer, Vishwanathan Iyer(Gemini Ganesh) falls in love with Avvai Shanmugi and to escape from this situation Avvai Shanmugi says that she was already married and her husband left her to Kasi. To find the truth Sethuraman Iyer follows her and he gets caught with Muthaliyar(Manivannan), who was also in love with Avvai Shanmugi. Seeing this he beats Sethuraman Iyer and by this time Avvai Shanmugi now comes as Pandian and he rescues Sethuraman Iyer and says to mudhaliar that Sethuraman Iyer was the husband of Avvai Shanmugi. Pandian says a different story to Sethuraman Iyer that Mudhaliyar was the husband of Avvai Shanmugi. Similary when all the members of Vishwanathan Iyer goes to a jwellery shop, Joseph comes there and he was asking money from Avvai Shanmigi. Watching this Vishwanathan Iyer questions Shanmugi who it was and she says thet it was her husband so she could escape from the situation. So Vishwanathan Iyer says that he will give money so that he should leave Avvai Shanmugi and Joseph who was money oriented accepts the offer and during this time Sethuraman Iyer comes in and says he isn't the husband but Mudhaliyar was the husband of Avvai Shanmugi, but Joseph somehow manages the situation. Nassar(Bhai) who was the friend of Pandian was working in a tea stall and seeing this Kamal says him to go and meet Avvai Shanmugi in Vishwanathan Iyer house and him to go as dumb and as a Brahmin. He also joins in the job but he was caught by sethuraman Iyer and they came to know thet he was a Muslim and he can also speak. However Avvai Shanmugi saves Bhai. At some point of time Avvai Shanmugi hints to Vishwanthan Iyer that Janaki's rightful place is by her husband, Pandian and Vishwananthan Iyer also realises this and tells Janaki that she has no place in his house. So this made Meena very angry and she attempts suicide, but Avvai Shanmugi(Pandian) stops her and finally reveals that he was Pandian who came as Avvai Shanmugi to Janaki's hous to look after his daughter.Finally Janaki and Pandian understand the mistake made by them and they live happily.