Perhaps Ning Ruixi has forgotten the incident at the last wedding banquet, but she simply can't forget.
Ever since she was a child, due to her looks, she has always been pampered by those around her. After going to college, the number of people pursuing her only increased. She was accustomed to a life of social climbing, basking in the admiration and envy of both sexes from her lofty position. It was because of this that she felt such dissatisfaction towards Wu Han, who was equally renowned.
Initially, she didn't think much of Ning Ruixi, her roommate of four years. You have to understand that those four years, Ruixi had seemed even more timid than a mouse. During that time, however, Ruixi was crazily in love with a classmate, Tang Yacheng, for the entire four years.
This, perhaps, is her lasting impression of her.