One day, some goons kidnapped Tamizhselvan in retaliation for his thwarting a black money scam six months ago.

Arjun takes away all the money but does not arrest Tamizhselvan due to his public reputation instead of telling him to surrender personally.

At night, he sneaks out of the house and steals the black money of a Union Minister, converting it to white with the help of a hawala trader.

It is an isolated village lacking basic amenities like roads, water, high schools, and proper housing and sanitation facilities.

Arjun later decided to get back all the black money acquired by Sivagnanam (which was the ₹300 crores recovered earlier) and the Union Minister and use it to develop Manimangalam.

Tamizhselvan drops all charges against Arjun, seeing that he had stolen the money, which was black for good intentions, and arrests the Union Minister.

In April 2016, it was announced that Vishal and Suraj would team up for a film titled Kaththi Sandai, which would be produced by S. Nanthagopal of Madras Enterprises.

[1][5] In June 2016, Tarun Arora was cast in a negative role after Suraj was impressed with the actor's performance in Kanithan (2016).

[8] The film's soundtrack and the score are composed by Hiphop Tamizha while the lyrics for the songs were written by Na.

[16] Writing for The Hindu, Baradwaj Rangan criticised the script and its execution, pointing out that the director "just wants to keep distracting you with songs and fights and comedy".

[17] Thinkal Menon of The Times of India wrote, "With a not-so-proper characterisations for the ones who played prominent roles and a done-to-death plot, the film, overall doesn't engage".

[19] Manoj Kumar R of The Indian Express wrote, "Be warned: Smoking tobacco causes cancer, watching this movie may have a similar effect on your mental health".

[20] Srivatsan of India Today, like Rangan, criticised the screenplay, adding "Do yourself a favour and keep from watching Kaththi Sandai".

[22] S Saraswathi of Rediff while calling Kaththi Sandai "a tedious action film" noted that both Vadivelu and Soori "appear to be wasted on this poorly-written script".