Saree Knot) is a 1983 Indian Tamil-language romantic comedy film directed and written by K. Bhagyaraj, who also stars alongside Urvashi.

Bhagyaraj based the story of Mundhanai Mudichu on his friend who lost his wife, and a woman who fell in love with him even as others started gossiping about them.

Another inspiration was a poster of Ramu (1966) which depicted its protagonist as a single father, and Bhagyaraj imagining himself in that position.

The film was remade in Telugu as Moodu Mullu (1983), in Hindi as Masterji (1985) and in Kannada as Halli Meshtru (1992).

Parimalam, a school drop-out, is a mischievous and nubile girl who perennially plays pranks on unsuspecting people in her village, aided by her gang of preteen boys.

When Parimalam opens the box, she finds jewels and costly sarees owned by Vaathiyar's late wife.

Meanwhile, Vaathiyar's son swallows a coin while playing with a neighbour, and Parimalam gets the child to take home.

When Vaathiyar fights with some people who are not supplying mid-day meals adequately to the schoolchildren and is almost stabbed, she saves his life by holding the edge of the knife.

Parimalam understands why Vaathiyar is hesitating to consummate the marriage; he fears she would ignore and mistreat his son when she has a child of her own.

By then, Vaathiyar learns of this and rushes to the hospital to stop it as he now understands her good intentions and does not want her to suffer.

Bhagyaraj asked himself if it was wrong for a woman to love a widower, and this laid the foundation for Mundhanai Mudichu.

[2][7] M. Saravanan of AVM Productions agreed to produce the film after he was impressed with Bhagyaraj narrating the whole script all by himself without the paper.

Bhagyaraj then offered the role to her 13 year-old sister Urvashi who accepted, making her Tamil debut.

After the film was completed, Bhagyaraj locked himself with his editor and "with a staple gun and a pair of scissors he stitched all this material together".

[26] Mundhanai Mudichu was remade in Telugu as Moodu Mullu (1983) and dubbed in the same language as Vaadante Pelli.

[29] In May 2020, it was announced that M. Sasikumar will star in a Tamil remake,[30] and Aishwarya Rajesh joined as the female lead.

[14] A sequel to Mundhanai Mudichu, titled Mappillai Vinayagar, was shot in 2012 with Lollu Sabha Jeeva portraying the Vaathiyar's son, but the film failed to have a theatrical release.