Good Boy is a story of wayward youth Vamsi (Rohit), who falls in love with Krishna Veni (Navneet Kaur) at the first sight.
Vamsi proposes to her. But, she has the habit of dillydallying with boys by keeping them under impression that she loves them too. When it reaches no point of return.
Krishna Veni reveals to Vamsi that she does not love him and ridicules him for his poor studies. With family responsibilities on his shoulders and rejection from the lover, Vamsi embarks on the ambitious task of passing civil service exams.
The rest of the story is all about how Vamsi wins both IAS and the Krishna Veni.