A Matter of Right and Wrong on the Theory of “Unite Chai and Dai as One"

People argued for the two heroines in A Dream of Red Mansions since it has been published. XUE Bao-chai and LIN Dai-yu, who is better? Or they are all positive characters for CAO Xue-qin, the author, what is called the theory of “Unite Chai and Dai as One. It is full of meaning to discuss the evaluation criteria of literature character on the base of retrospect and analysis of the theory.