Become a burden in a period novel

Qin Wangshu traveled through time and space and entered a book. However, she was not the protagonist, nor the female supporting role. Instead, she was a background board that only appeared in the mouth of the heroine. Her only role was to give the heroine a golden finger and connections. Qin Wangshu, who traveled through the book, decided to stay away from the hero and heroine, and use the plot she knew to become a first-generation rich...