In Sundeep Kishan's past, father T Siva dies due to medical crime, he finds out that the doctor has no medical knowledge or practice. He immediately files a complaint against the doctor and hands him over to the police. Since his father died due to medical negligence he talks his sister into studying for medicine. Him on the other hand, runs a catering business, along with his close friends; Vikranth, Soori, and Appukutty.
Meanwhile, Harish Uthaman, a ruthless area criminal, tries to kill Sundeep's sister, who will secretly be in a relationship with his best friend, Vikranth. Likewise, Vikranth is also being followed to be murdered. The rest of the plot revolves around how Sundeep's perspective changes when he finds out about the relationship between his sister and best friend, why is Harish Uthaman trying to murder his sister and how will he save Vikranth out of the mess he has gotten himself into.
Sundeep Kishan has pulled off his character effortlessly. Living up to the impression he has already made within the Kollywood audience with his performance in Maanagaram, which was released on March. He once again proves that he has all the credentials to be successful artiste. Mehrene Pirzada has very little to perform other than being the hero's love interest, which is a drawback, as this is her debut film in Tamil. Vikranth plays a pivotal role and has yet again delivered a convincing performance. Soori's comedy works in parts, and same goes with Appukutty.
Filmmaker Suseenthiran has made a film which seems to be like a compilation of his previously directed movies; Naan Mahan Alla and Pandiya Naadu. While those films' were applauded as it was new, racy and a compelling watch, Nenjil Thunivirunthal was a let down, as the first half of the movie was slow and draggy, with little elements to keep the audience interested. The film gains momentum and purpose only with the second half, yet, the screenplay had nothing new to offer, and felt like something was a miss.
Laxman Kumar cranks the camera and his shots are impressive, and is an advantage to the film's success. D Imman has handled the music department and his background scores justify the movie's genre, but the same cannot be said for his songs, as it was average.
In short, Nenjil Thunivirunthal, could have been better.