Wu Xinyu's days at the Wu Family were not as good as she usually showed.
Her father believed strongly in gender preference; her mother had damaged her health giving birth to her and couldn't conceive again. Her father had always wanted a son. Thus, he found a mistress.
This mistress was formidable, and her ability to bear children was commendable. She knew Wu Xinyu's father had always wanted a son and knew that giving birth to a son was her chance to marry into the Wu Family.
Indeed, after she got pregnant, she actually gave birth to a son, which overjoyed Wu Xinyu's father.
To legitimize his son and not have him as an illegitimate child, Wu Xinyu's father, disregarding her mother's crying and pleading, divorced her mother. When her parents divorced, they had asked her with whom she wanted to live.
Wu Xinyu didn't think twice before answering that she wanted to stay with the Wu Family.