The film begins in a jail in Paris, where a prisoner named Manohar (Sivakarthikeyan), who is from Chennai, India, has just been released on bail provided by the Indian Embassy. Before his release, he tells the jail warden about how he ended up in the Paris jail.

Mano is a middle-class youth who works as a salesperson in KUN Hyundai managed by Kuthala Sithambaram (Robo Shankar). One day, he meets with a minor accident involving Keerthana Vasudevan (Nayanthara), who is a television serial producer. Keerthana is an arrogant woman and soon develops a hatred for Mano, who constantly irritates her with his antics. Keerthana's hatred for Mano is such that she buys the KUN Hyundai showroom only to fire him, and she even goes to the extent of firing Sithambaram and Mano's friend Raja (Sathish) just because they oppose her decision of terminating Mano. Mano soon develops romantic feelings for Keerthana, but this only increases the friction between the two. Later, Keerthana meets with an accident and is admitted to the hospital by Mano, who even donates blood to her to save her life. Keerthana, who appears grateful to Mano for his gesture, invites him to Paris to meet her aunt and uncle and spend a few days with them, but this turns out to be a trap hatched by Keerthana to get rid of him once and for all. Keerthana speaks ill of Mano's family, which causes him to get angry and slap her. For this reason, he is arrested.

In the present day, following his release, Mano borrows the warden's motorbike to meet Keerthana before leaving for India. He sees Keerthana being chased by goons led by her fiancé Ashwin (Narayan Lucky) since she had called off the engagement after finding out that Ashwin is a transgender man and a misogynist as well. Mano saves Keerthana from Ashwin and his goons, after which he leaves for India. It is at this juncture that Keerthana realises that she too loves Mano. She returns to Chennai a few days later and accepts Mano's love.

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