@srestha
Ma'am, i guess what i'm trying to say is unclear.
i'm saying that, suppose M is my MST. now a vertex v is added to the MST, and there is an edge from vertex v to every other vertex in the MST M,..., then what will be the scenario. As we can see that this is not the case of complete graph. (this is because, we are adding vertex and edged to the MST not the original graph)