Having transmigrated into a book, who would still want to be a secondary wife?

"Transmigration + Cannon Fodder + Beloved + Satisfying Story + Strong Female Lead" Song Ruozhen transmigrated into a book, becoming the male lead's deceased ex-wife. Her immense wealth allowed the male and female leads to live a life of luxury, while her entire family became the contrast, dying tragically. On her wedding day, two bridal sedan chairs entered the house together. The clearly entitled first wife, holding the marriage certificate, was not only made a concubine, but it was also considered a favor to her? Song Ruozhen: "Damn it! Who wants to be a concubine?" What's wrong with having such a vast fortune? Why should she willingly give it to the male and female leads? Let whoever wants to be this unfortunate victim be! Her father disappeared? As the head of a powerful sect, she was skilled in divination, fortune-telling, finding people, and feng shui—she could find him! Her elder brother was crippled and committed suicide? After curing him, she would reclaim her military merits...