One day, Chettiyar Amma finds a man shivering due to intense cold weather in Top Slip, Pollachi. She immediately rescues him and treats him like her own son. The man's original name in Surieyan, an IPS officer, but he hides his identity and prefers being called as Mottai. Surieyan gets employed as a driver to Usha, the only arrogant daughter of a rich landlord Koopu Konar (Rajan P Dev). Usha ill-treats Surieyan but upon realising his true identity, she feels confused. Surieyan tells his back story.

Surieyan, an IPS officer is employed in Security forces. During an international summit in Bangalore, the home minister of India urges Surieyan to devise a strategy to assassinate the Prime Minister of India promising him a few thousands of dollars in return. Surieyan gets furious and kills the home minister for which he is wanted by the police. Surieyan escapes from them and hides in Top Slip as he previously overheard home minister's conversation to his henchman Micky. Surieyan hides his identity and keeps monitoring the forest to trace the activities of Micky, so that he can prove his innocence.

Usha falls in love seeing Surieyan's dedication to nation. She elopes from her house and marries Surieyan contrary to her father's wishes. Meanwhile, Surieyan finds some suspicious activities in the forest and keeps track of them to gather evidence. Finally he finds out that Micky is under the protection of Koopu Konar and Micky plans to assassinate Prime Minister during his visit to Pollachi. Police trace the whereabouts of Surieyan and arrest him. Micky and Koopu Konar plan to kill Surieyan, so that they are saved. Koopu Konar secretly plants a bomb while visiting Surieyan in prison, but unfortunately, Koopu Konar himself gets killed in the attack. Surieyan escapes from prison and finds out Micky and kills him. In the end, the Prime Minister visits Surieyan and thanks him for his dedication.