Summa Nachunu Irukku (English: It is Just Amazing) is a 2013 Tamil comedy film directed by A. Venkatesh. The film features Thaman Kumar, Vibha Natarajan and Archana Vishwanath in lead roles along with an ensemble cast including Thambi Ramaiah, Sreenivasan, Appukutty and Erode Mahesh. The film, produced by B. Vimal, had musical score by Achu Rajamani and was released on 30 August 2013. The story of the film was inspired by the 1997 Malayalam film Chandralekha.

An ex-convict forges signature of a deceased medical student to get enrolled in a medical college. He kills his roommate by accident in a dispute and fears that his identity will be revealed.

Karthik’s flirting ways during his college days leave a bad impression on Malar. A few years later, the two end up working at the same office, though they are on different floors. Karthik falls in love with Malar but considering that she hates even the very mention of his name, he introduces himself to her as Sundar. How long can he carry on this game of deception?