Different family background: Du Neshka is a poor tutor; Dunia, Raskolnikov's sister, was well educated and had a relatively rich family.

The characters are different: Du Neshka chose to marry a man who is twenty years older than her for the sake of her family and her own life, and her character is kind and obedient; In order to help her family, Dunia once worked as a governess and accepted the marriage proposal of Lu people, which shows that she has a tough character.