Johny (G. V. Prakash Kumar) is a happy-go-lucky guy who is mistaken as a notorious gangster by his lover Hema's (Anandhi) father Dass (Saravanan) aka Naina, an ageing gangster who wants a person to replace him as the Naina in Royapuram and become his son-in-law. Johny has a disease which causes him to repeat his previous words if he sees blood. How Johny eliminates his rivals and becomes the next Naina forms the rest of the story.