One day, Thangavelu lands in Lalitha's house looking for a prostitute. Both are shocked to see each other; Thangavelu, who was believed to have died after leaving home, is upset that Lalitha has fallen so low and leaves. As years pass, Lalitha's siblings progress; Thyagu becomes a doctor, sister Mangalam becomes a singer; younger sister Devi falls in love with Pasupathy, son of a landlord, and their marriage is fixed. Lalitha returns home after a long time and is warmly received. But she feels depressed and frustrated to know that her mother is again in the family way and criticises her parents' lack of responsibility. On the day of Devi's wedding, Lalitha is shocked to see that Pasupathy, her client in Hyderabad, is the groom. She fears he would cancel the wedding knowing that the bride is her sister, but he performs the wedding rituals mechanically and looks withdrawn. Lalitha and Pasupathy meet privately, decide to forget past incidents and move on. When Udaiyaar is about to perform the "thevasam" for his son, Lalitha intervenes and reveals that Thangavelu is alive, but does not explain the circumstances under which they met.