Vijay Sethupathi and Madonna Sebastian are involved romantically with each other right from their college days and life is at its best when a difference of opinion leads to their separation by the time they complete their studies. Vijay Sethupathi, who has been interested in journalism right from an early age finally manages to land a job in Akashdeep Saighal's news channel. It is here that Vijay Sethupathi once again meets Malar.
In the meantime, politician Bose Venkat , who runs a industry dumps the waste minerals generated in a nearby lake. Taking note of the issue, Vikranth, who is a social activist along with his girlfriend and friends stage mass demonstrations condemning the act. Noticing the issue spiraling out of his hands, Bose Venkat orders the protest to be stopped under any cost and his henchmen rape Vikranth's girlfriend. She is then admitted in a hospital for treatment when Madonna Sebastian, who is her friend comes to know about the disastrous ordeal. She along with Vijay Sethupathi decide to shoot an interview of the victim. They then air the interview and this upseta Bose, who gets in touch with Akashdeep Saighal. The two strike a deal and alter the news accordingly.
A Mudhalvan-style live interview between Vijay Sethupathi and Bose Venkat is then scheduled. Vijay Sethupathi's management then orders him to make the interview an event which glorifies Bose Venkat and not question anything that would upset the politician any further. After a segment is telecast live, Vikranth and his girlfriend who have been watching the show call up Vijay Sethupathi and plea with him. This torments Vijay Sethupathi's conscience, who in the second half of the interview segment fires up and questions Bose Venkat in a fiery manner. Since he is unable to answer Vijay Sethupathi's hard-hitting questions, the interview is then cut off.
Vijay Sethupathi then resigns from Akashdeep Saighal's news channel and joins the daring T. Rajendar, who runs a small channel. They then form a partnership and bring to light the various wrongdoings Bose Venkat and Akashdeep Saighal have been and are continuing to commit. How the two then bring them down forms the rest of the plot of Kavan.
Although T. Rajendar hasn't been seen on-screen for a while now, the veteran multi-talented star makes it up in Kavan this time. His energetic act along with fiery dialogues not only draws applause from the fans, but also a double thumbs up for his power-packed performance. All the scenes he is featured draw cheers from the audiences. Vijay Sethupathi this time has handled a heavy role and has performed with finesse. The actor, who has formed his own style in acting has trumped as the college student, the news reporter and as a social activist. His acting prowess is at a full flair especially in the scenes he comes as the news reporter. Madonna Sebastian has performed her role with extreme care and has nailed her portions to a tee. Her performance in the film will be talked in the days ahead. Vikranth deserves a special appreciation for his performance as the social activist. His role strikes a chord with the fans - be it his anger, his dialogues - he moves us all. Although his screen time is short, he delivers a powerful performance. Akashdeep Saighal, who has returned to Tamil cinema after Ayan has once again come out on top. His role as an evil television channel head makes the veins in our body pop up and this is a true testimony of an actor who has excelled with his performance. Bose Venkat, who is a notable performer on the small screen has elevated himself in his role this time in Kavan as a politician as well as a rowdy.
Filmmaker K. V. Anand deserves applause for showing two sides of the media. He brings to light certain powerful people who exploit their influence in media in evil ways as well as few other individuals who use the same media to show the good that can be done if done right. In addition, the dialogues are both strong and thought-provoking and, Kabilan Vairamuthu needs to be appreciated for writing a screenplay that has portrayed a relevant topic in such a fantastic manner. His writing skills come to the fore in the scenes he has written for both T. Rajendar and Vikranth's characters.
Hiphop Tamizha, who has carved an own niche for himself in the industry has given good songs in the film; especially the "Oxygen Thandhale" and "Happy New Year" songs. His background score is at an all new level and elevates the film altogether. Cinematographer Abinandhan Ramanujam's skills come to the fore as he has shot the film in an impressive manner. The entire film looks outstanding visually.
In short, Kavan hits the bulls-eye.