Thulladha Manamum Thullum (Tamil: துள்ளாத மனமும் துள்ளும் English: (lit.) Hearts That Don't Jump, Will Jump) is a 1999 Tamil romantic film directed by Ezhil. The film stars Vijay and Simran, while Manivannan, Dhamu and Vaiyapuri among others play supporting roles. The film, produced by R. B. Choudary, has its score and soundtrack composed by S. A. Rajkumar and cinematography handled by R. Selva. The film went on to win critical acclaim and was declared a commercially successful venture at the box office.
Kutty (Vijay) wants to become a singer while working as a local cable provider run by Mani (Manivannan). His songs are appreciated by a college student Rukmani (Simran) and each time when she wishes to meet him, circumstances project him as a transitive element. He also becomes the cause for Rukmani losing her eyesight and repents for it. He starts to love her and he regularly writes to his mother about the development of love he has for Rukmani. When his mother dies, she offers her eyes to Rukmani. To meet the cost of the eye transplant, kutty offers his kidney to a Pune-based rich man. While returning home he inadvertently becomes an accomplice in creating explosives and he's arrested. Having regained her vision, Rukmani, who had studied for IAS, becomes a Collector and when Kutty tries to contact her, he is still the rowdy element in her mind. Finally the confusion is cleared and the lovers can be together.
The film saw director Ezhil, an erstwhile assistant to Robert-Rajashekhar, Panneer and Parthiban, make his debut as a film-maker under R. B. Choudary's production house. Prior to release, the role of Vijay's mother in the film was kept under wraps with the media speculating who would play the role. Eventually, no actress played the role although the character played a pivotal part in the film. Vijay took a pay cut for the film, accepting only 30 lakh rupees instead of 50 lakh rupees, as he had signed the film before the release of his blockbuster Kadhalukku Mariyadhai. Initially Ezhil wanted comedian Vadivelu to play the lead role, Vadivelu who was impressed with the story has said to Ezhil that the story line was too good and he doesn’t know whether it will work with him in the lead. Vadivelu also asked Ezhil to wait for six months, if he didn't get anyone hero then he will act in it then he was replaced by Vijay.
The film went on to become a blockbuster, running for hundred days across dozens of theatres in Tamil Nadu, while it also enjoyed similar success in the neighbouring state of Kerala. Vijay and Ezhil immediately decided to follow up this film with another collaboration, Pennin Manathai Thottu, with either Isha Koppikar or Roja to be roped in as the lead actress. However soon after pre-production, Vijay was replaced by Prabhu Deva and the film went on to release in 2000. The success of the film led to more offers for Simran, who with Thulladha Manamum Thullum and Vaali, established herself among the leading actresses in Tamil films. Vijay and Simran were also paired together in several other films after the success of Thulladha Manamum Thullum, with projects titled Priyamanavale and Udhaya launched weeks after this film's release.
A critic from the Deccan Herald mentioned that "the experience of seeing the film is simply thrilling", mentioning that the success comes from "the naivete, the simplicity, the absolute lack of sophistication, and from the delightful hero (Vijay)".