It refers to an event on the internet: one of the girls invited her eldest brother named Ye to have a magical conversation with the head of the dormitory because of the problem of cleaning. The conversation is full of extremely arrogant words.
Ye Meijing-comments from netizens, is Ye's sister.
For example, someone made a joke: Hello, I'm Ye's sister, and my name is Ye Meijing. If any of you dare to bully me in the future, my brother has a hundred ways to keep you from living. . . . . .