In the film, an ex-R&AW agent sets out to track down a scientist, who has created a hazardous drug that can boost adrenaline levels.

[citation needed] Harris Jayaraj composed the soundtrack and musical score, while R. D. Rajasekhar and Bhuvan Srinivasan handled the cinematography and editing respectively.

Since Omm is under suspension, Malik assigns him as a deputy to a junior R&AW agent named Ayushi Dash and the two of them leave for Kuala Lumpur.

It is then revealed that YASHASWINI suffers from retrograde amnesia after being attacked four years ago and that Naman took advantage of her situation to employ her as a computer hacker to create an impenetrable firewall.

YASHASWINI reveals that she had been forced to take Speed by NAMAN to work faster, but the drug caused her to regain old memories, including those with Omm.

Omm finds out that Love had made a satellite call to Chang, the Transport Minister of Malaysia, who had allowed Naman to send shipments of Speed inhalers to India to perpetrate terror attacks there in return for money.

They sneak into an illegal airfield owned by Chang, where Naman is planning to leave for India with the shipments of Speed inhalers.

A few weeks later, Omm and Yashaswini are enjoying a holiday cruise on a private boat, sponsored by the Government of Malaysia, as a reward for killing Naman.

[4] The delays meant that Vikram stopped waiting for the makers to begin work, changed his specially-prepared facial hair and went back to add finishing touches to his other ongoing project, 10 Endrathukulla (2015).

[5][6] Ayngaran International backed out of the film in November 2015, prompting Anand Shankar to re-approach different producers to find new funding for the project.

In early 2016, the team shot two schedules in Malaysia and then in Chennai, before Anand Shankar headed to Kashmir to scout for further locations.

[13] M Suganth of The Times of India gave 3/5 stars and wrote "If Anand Shankar's previous film Arima Nambi had echoes of K. Bhagyaraj's Rudhra, the set-up of Iru Mugan recalls that of Kamal Haasan's Vikram.

"[14] Sowmya S of Hindustan Times gave 3/5 stars and wrote "Iru Mugan is not free from commercial cliches but it still is a fun ride as a fast-paced thriller laced with chemistry and history lessons on drugs.

"[15] Srivatsan of India Today gave 2.5/5 stars and wrote "Iru Mugan could've easily been Tamil cinema's answer to Hollywood thrillers but it's neither a damn-good film or a bad one.

"[16] Anupama Subramanian of Deccan Chronicle wrote "Although formulaic in nature, Iru Mugan is a straightforward drug-infused thriller that is high on tempo and very unrelenting.

"[17] Sreedhar Pillai of Firstpost wrote "Iru Mugan is a one-time stylish and racy entertainer and an out and out Vikram show, which has its moments.