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It was noted that Premgi earlier composed one song in Chennai 600028 film and also doing the additional background score of the director's previous films as well. For this film, director Prabhu decided to pick Premgi Amaren to compose the film's soundtrack and the background score entirely, replacing his usual choice, Yuvan Shankar Raja who composed for all the director's ventures. The project was publicly announced in a promotional event for the film Gemini Ganeshanum Suruli Raajanum. Party is entirely filmed in the Fiji Islands.
Nassar as Benjamin Button: a businessman. Sanchita Shetty as Adithi: a mastermind. Ramya Krishnan as Abhirami: a socialite. Jayaram as Rajashekhara Pandian / RSP: a casino kingpin. Shiva as Babu Murali / Bob Marley: a drug peddler.
Jai as "Zero Error" Charlie: a small-time kidnapper. It's hard to think of anyone else among the current crop of young actors who could have carried the weight of the title role as flawlessly as Dhanush does. Give Dhanush a good script and he delivers a performance that has you spellbound. Yaman (Lal) is the older, wiser man who serves both as an impetus to propel the young Karnan towards being the hero his small village needs, and is a steadying hand during his more hot-headed moments. Conversing with each other primarily in barbed, but harmless witticisms, their friendship is believable and entirely loveable. Yogi Babu is thankfully again, as he was in Pariyerum Perumal, given a character who doesn’t have to be a figure ridiculed for his looks, slapped around and be the centre-piece of casteist, racist jokes. It’s a simple ask that Tamil cinema stops using dark-skinned, kinky-haired people as props for their slapstick comedy. In Karnan, he has a complex role: a person who seems to have some of the right intentions, yet also must navigate past his several flaws to discover a better version of himself. Karnan’s love-interest Draupathi (Rajisha Vijayan in her Tamil debut) is an integral part, but could have had more to do. Mari Selvaraj returns to the Tirunelveli agricultural-belt where his debut film was also set.
At the audio launch of Karnan earlier this week, he spoke of how so many stories and cultural modes of storytelling reside in these small villages he knows so well. He also mentioned that while the distinct cultures of the region have made it to mainstream Tamil cinema, the people and their lives have not.