Radha falls in love with her brother's friend, and Rajasekhar eventually arranges for their marriage.

The story of Pasamalar was written by K. P. Kottarakkara, which Bhimsingh expanded into a screenplay, with Aaroor Dass writing the dialogues.

The film's original soundtrack was composed by M. S. Viswanathan and T. K. Ramamoorthy, while the lyrics were written by Kannadasan.

Pasamalar was released on 27 May 1961 and received critical acclaim with Ganesan and Savitri's performances being widely lauded.

It became a trendsetter resulting in similar themes about brother-sister relationships and was remade in Hindi, Telugu, Kannada and Malayalam languages.

When the factory where Raju works is closed due to a labour problem and he is depressed, Radha gives him ₹1000 which she had earned and saved by making toys.

Malathy files a counter petition and the property is attached by the court, pending resolution.

He approached A. Bhimsingh, a director who gained a reputation for making successful family drama films, and narrated the story to him.

Actor Sivaji Ganesan also liked the story, got to play the lead character of the brother Raju, and got his friends M. R. Santhanam and K. Mohan to produce the film on behalf of Rajamani Pictures.

[5][6] A dialogue in the film that Raju tells Anand (Gemini Ganesan, not related to Sivaji) which translates to "You may switch off the electric lights here.

That man is this Raju" was inspired by a line Dass earlier told Sandow M. M. A. Chinnappa Thevar as a refusal to write for one of his films: "Even if it is only a small lamp, let it be exclusively mine.

[8] According to Soorian Kasi Pandian, author of the 1996 book India, That Is, Sidd, Pasamalar means "Flower of Love".

[24] It was remade in Telugu as Rakta Sambandham (1962) with Savitri reprising her role, in Kannada as Vathsalya (1965),[25] and in Malayalam as Santha Oru Devatha.

[28] Playback singer Asha Bhosle noted that Pasamalar was the first Tamil film she had watched.

[30] Actor Sivakumar stated, "You can't reproduce movies like Parasakthi, Pasamalar, Devadas, Veerapandiya Kattabomman or Ratha Kanneer [...] By remaking such films, you are lowering yourself, while it enhances the original artists' image".

[37] A digitally restored version of Pasamalar was released on 15 August 2013, during India's Independence Day.

[40] M. Suganth of The Times of India rated it 5 out of 5, saying "The restoration, cinemascope and audio conversion are pretty good while the trimming (by veteran editor Lenin, Bhimsingh's son) manages to retain the continuity to a large extent.