The film stars Vijay Sethupathi, Gayathrie, Guru Somasundaram, K. P. A. C. Lalitha, Anikha Surendran, Jewel Mary, and Shaji Chen.
One day, a man left some gold jewellery in his automobile, and Krishna helped return it.
Krishna, Mayilu (a house broker), and Bhai help Savithri and her father find a new home.
To do so, he promises real estate businessman Madhavan that he will assist him in selling all the plots to his villagers.
Eventually, Krishna's kids grow up, and Savithri decides to pay off Bhai using his son's salary.
According to Krishna's friends, he left the town shortly after Madhavan's mother died, and they discovered his objective.
In April 2017, reports surfaced that Vijay Sethupathi had signed a new project with Seenu Ramasamy after the success of Dharma Durai (2016).
[6] During the start of the shoot, Guru Somasundaram was announced a part of the pivotal cast, with Seenu stating his character as an important one which appears throughout the film.
[8] During the schedule of Kerala, stills featuring Vijay Sethupathi and Malayalam actor Manikandan Achari went viral through internet, with the latter reported to play a supporting role in the film.
[14] The film marked the first collaboration of Ilaiyaraaja and his son Yuvan Shankar Raja working together and the final song recorded by his daughter and playback singer Bhavatharini before her death to cancer.
[15][16] Ilaiyaraaja's inclusion in the project was announced on 25 January 2018, when he was felicitated with Padma Vibushan by the Government of India,[17] Yuvan stated that the collaboration with his father and brother, made his "journey of a music director being meaningful and purposeful".
[15][18] The film's director Seenu Ramasamy also thanked Yuvan for his initiative in bringing the Raja family collaborate on a project, in his interview with The Times of India.
[22] The first single track "Thattiputta" was released by U1 Records on 7 April 2021, which had vocals performed by Ilaiyaraaja and written by Pa.
[23] Another song "Ye Rasa" was released on 28 May 2021, which also had a promotional video featuring Yuvan Shankar Raja.
[27] The producers reportedly started negotiating with streaming platforms for a direct-to-streaming release, as theatres were shut down due to the COVID-19 pandemic.
[28] LetsOTT revealed that the film is scheduled for a digital release through either ZEE5 or Amazon Prime Video, although no official confirmation was made by the producers.
[30][31][32] Both the Tamil Nadu and the Kerala distribution rights of the film has been bagged by R. K. Suresh under the banner Studio 9 Productions.
"[39] Manoj Kumar R of The Indian Express rated 3 out of 5 stars stating that "Maamanithan is Seenu Ramasamy's meditation on life.
"[40] Sudhir Srinivasan of Cinema Express gave 3.5 out of 5 stars stating that "Noble intentions fail to make up for the lack of novelty and entertainment in this Seenu Ramasamy directorial".
[41] Janani K of India Today gave the film 2.5 out of 5 and stated "Overall, Maamanithan is a moving drama with its heart in the right place.
"[42] Soundarya Athimuthu of The Quint stated that "Maamanithan has its heart at the right place for it instills hope in human relationships, explaining while there may be one or two who will cheat or hurt you, there will be dozens waiting to support and embrace you with love.