Nanaku prematho is a cool revenge story of the rajendra prasad over the jagapathi babu for cheating him and making him unpopular in the people.
His son ntr will take revenge over the jagapathi babu by stealing all the money with him and making him as unpopular the way jagapathi babu cheated the rajendra prasad. And ntr makes his father happy by showing that he cheated jagapathi babu and made him unpopular. The Father will be happy dying.