Manian, a cycle-rickshaw puller, is a road-side dweller along with his wife Valliamma and their seven children – two daughters and five sons. Despite being the sole breadwinner of his family, Manian spends the majority of his meager earnings on liquor. His wife struggles to make ends meet with the remaining amount. Her friend Rakkamma, a street food vendor, lends financial support to Valliamma's family. The educated Krishna, one of Manian's sons, elopes with a girl and separates himself from the family. Manian's daughter Kuppamma along with her friend Chellamma contribute a small income to the family by picking up rags on the roads. Rangan, a kindhearted lorry driver, befriends Kuppamma and offers assistance to her whenever she is in need of any help. They both get close to each other and their friendship leads to a physical relationship. When Valliamma gets to know this, she commits suicide fearing that Kuppamma's act has brought disgrace to the family. Meanwhile, Kuppamma gets shocked when she learns that Rangan is already married. With an intention to not disclose Rangan's identity, she keeps herself away from him. During this time, Kuppamma finds out that she's pregnant. Despite the advice of fellow road-side dwellers to abort the child, she refuses to do so. She also protects Rangan's identity by informing her relatives that her lover had died in an accident. Knowing that she is about to deliver their child, Kuppamma wishes to meet Rangan. But Rangan had relocated to another locality after she turned down his support. When Rangan's wife gets to know of the relationship, she empathises with Kuppamma and insists that Rangan bring her to their home. When Rangan reaches the slum, he finds Kuppamma in throes of labour pain. Kuppamma dies soon after, upon delivering their child. Rangan and his wife then decide to adopt the child as penance for Rangan's sins.
The film focused on the plight of roadside dwellers. Durai, who is known for making commercial films, made Pasi in a realistic manner by compromising on commercial aspects such as songs and dance sequences. The background score was composed by Shankar Ganesh. The Government of Tamil Nadu provided a subsidy of 100,000 for the film.
Reception
Released on 21 December 1979, the film met with unanimous critical acclaim. It was equally successful at the box-office, running for more than 100 days in the theatres. In 1984, Durai himself remade the film in Hindi as Pet Pyaar Aur Paap, starring Smita Patil and Raj Babbar. A review from the Tamil magazine Ananda Vikatan, dated 13 January 1980, appreciated the film for its realistic depiction of the lives of the poor. It also praised Shobha's acting and Ranga's camerawork. Durai's script and dialogues received equal praise but the end credits of the film were criticised as it was considered as not being appropriate to the characters of the film. The same year it was screened at the Tashkent Film Festival. The film served as a launchpad for Senthil, who would later go onto establish himself as one of the popular comedians in Tamil cinema in the 1980s. Another debutante Sathya, who played Shobha's friend Chellamma, acquired the prefix "Pasi" after the film. Shortly after receiving the Best Actress award at the 27th National Film Awards and a day before the 100th day celebration of the film's success, Shobha committed suicide by hanging herself at her residence in Madras.
