He is declared brain dead, and the doctors request his mother, Gowri Thiruselvan (Suhasini Maniratnam), to donate his organs.

Siva, who gets a new lease of life, plans to start a business to take care of his family, unaware of the issues he would be facing in the coming days.

Siva learns from Gowri that his face donor (Shakti) was not really her son, and another friend reveals that he hailed from a village near Trichy.

Initially, Shakthi and his friends face resistance in the form of the local councilor Mayilvaganam (Ravi Mariya), who insisted that all farmers sell their lands to him for money instead of continuing agriculture.

The three friends initially face tough challenges in the form the government officials and even the local police, but overcoming all struggles with the villagers' support, the trio protest in front of the district collector's office to obtain permission for constructing the canal.

Things go awry when two goons enter the crowd in disguise and incite violence, thus forcing the police to charge on them.

One day, a sudden landslide occurs, and in a bid to escape, a lot of people get buried underneath and lose their lives, including Shanmugam.

The laptop contains details about various people supporting Shakthi and his friends in the initiative, including residents of that neighboring village.

During their train journey, Gigi tells Siva about a drug that, when administered into a person, causes excessive adrenaline rush, eventually leading to death by loss of breath, while leaving no traces in the blood.

In the final scene, Siva is shown getting down from a bus to go to Shakthi's village, presumably to continue Shakti's unfinished work.

[2] Megha Akash was signed on to portray the female lead actress, while Upen Patel was selected as the film's antagonist.

For a particular look in the film, Atharvaa had to wear heavy prosthetic make-up with designers Preetisheel Singh and Mark Troy D’Souza assisting with the makeover.

Boomerang was released on 8 March 2019[8] Film Companion South wrote, "What promised to be pulpy fun, with the face swap, turns into a dully earnest story about river-linking.