The film stars Sivakarthikeyan as Major Mukund Varadarajan, alongside Sai Pallavi, Rahul Bose and Bhuvan Arora.

It is an adaptation of the book series India's Most Fearless: True Stories of Modern Military Heroes by Shiv Aroor and Rahul Singh, which contains a segment based on Mukund.

Shortly afterward, they fall in love and begin dating, and Indhu eventually finds out that he wants to join the Indian Army.

However, his mother, Geetha, upon finding this out, starts to oppose his decision; still, a determined Mukund passes his Officers Training Academy entry exam with the support of Indhu and Varadarajan.

Meanwhile, when Indhu expresses her love for Mukund to her family, her father, George Varghese, and her second elder brother, Deebu, show anger and reluctance, due to the fact that he was a Tamilian, and that too, an Army officer.

After a year of silence, both the families agree to their marriage and they get married on June 30, 2009, after which, the couple get pregnant and have a daughter named Arsheya, on March 17, 2011.

Afterwards, Mukund gets posted into the Rashtriya Rifles battalion in the 44th regiment, on October 18, 2012, in place of the previous Company Commander, Major Mithun Mohan.

After many months of gathering information, Mukund and his CAT team finally kill Altaf Baba, after a tough fight and stone pelting by civilians on June 2013.

Venkanna, Joginder, Jyoti, and Hardeep evacuate the civilians while Ravi, Michael, Waheed, Rajesh, and Saifudeen cover Mukund and Vikram as they enter in the house.

Dabas insists many times that they come back as unknown explosives were planted inside the house; however, Mukund and Vikram are firm on their decision to not let Wani go.

Mukund's body departs from Kashmir with gun salutes and a teary farewell from the CAT team and Amit Singh Dabas to Tambaram, where his funeral procession takes place.

Presently, Indhu receives the Ashoka Chakra from President Pranab Mukherjee on 26 January 2015, and a bust of Mukund is opened up in Officers Training Academy, in Chennai, on June 1, 2015.

The film ends with Indhu sitting next to his monument and feeling the presence of Mukund leaning on her shoulder, but later fading away, implying that it is his soul, which is still bonded to her and his daughter, and will always be.

[7] The director, however, changed his mind after he was suggested by Vakil Khan to read one of the chapters from the book series India's Most Fearless by Shiv Aroor and Rahul Singh, which is about Major Mukund Varadarajan.

[18] Sivakarthikeyan underwent immerse training for almost a year during the pre-production process for his role as Mukund Varadarajan;[19][20] he was also disallowed from revealing his hairstyle in public, covering his head with a beanie until the film's first look poster was released.

[26] Bollywood actor Bhuvan Arora was revealed to portray Sepoy Vikram Singh, Mukund's colleague, in his debut Tamil film.

The track featured the vocals of Jen Martin, Sathya Narayanan, Madhuvanthy Ganesh and Ramani, and lyrics penned by Vishnu Edavan.

[72] The film began streaming on Netflix from 5 December 2024 in Tamil and dubbed versions of Telugu, Malayalam, Kannada and Hindi languages.

Amaran received widespread critical acclaim, who praised Sivakarthikeyan and Sai Pallavi's performances, direction, screenplay, G. V. Prakash's soundtrack and background score.

[74][75][76] Jagadish Angadi of Deccan Herald gave 4/5 stars and wrote "Sharp editing, gripping pace, engaging narrative and impressive production design make this soul-stirring military drama a perfect family watch.

"[77] Kirubhakar Purushothaman of News18 gave 4/5 stars and wrote "Rajkumar Periasamy needs a huge salute for making a subtle but incredibly touching ode to a soldier.

[...] Amaran doesn't rely on easy gimmicks; instead, it builds genuine heroic moments, with Sivakarthikeyan delivering a restrained yet powerful performance.

"[78] Avinash Ramachandran of The Indian Express gave 3.5/5 stars and wrote "With wonderful performances by Sivakarthikeyan and Sai Pallavi, Amaran is a poignant yet powerful tale about Major Mukund Varadarajan's love for India, and his wife Indhu.

"[79] Roopa Radhakrishnan of The Times of India gave 3.5/5 stars and wrote "Amaran is a worthy tribute to the legacy of Major Mukund Varadarajan.

"[80] Janani K of India Today gave 3.5/5 stars and wrote "Amaran is a beautiful, emotional and intriguing ode to Major Mukund Varadarajan and army men like him.

"[81] Kusumika Das of Times Now gave 3/5 stars and wrote, "Rajkumar Periasamy's direction, combined with strong performances by Sivakarthikeyan and Sai Pallavi, make Amaran a must-watch for those interested in stories of patriotism, love, and sacrifice.

"[82] Gopinath Rajendran of The Hindu wrote "A pacy screenplay, marvellous performances and excellent technical prowess make Amaran a brilliant ode to the resilient families who love their bravehearts.

"[84] Latha Srinivasan of Hindustan Times wrote "Amaran is a wonderful tribute to those serving in the army and their families and is a stark reminder that our freedom exists because of their sacrifices.

One walks away from Amaran with a heavy heart for those who lost loved ones on the battlefield and yet, happy that their legacy will never go unknown and be immortalized on the silver screen thanks to directors like Rajkumar.

"[85] Mukund's Commanding officer, Amit Dabbas, had expressed his gratitude to the team of the film and also requested the viewers to appreciate the strength of the people who serve the country.