My Wife is a Love-Brain Female Supporting Character

In the third year of Pei Lan's transmigration, she realized she might have been transported into a book—and worse, she had become a background cannon fodder. The reason was that her mother suddenly produced half of a jade pendant, telling her it was her betrothal token—turns out she had a fiancée arranged before birth, turns out her family had fallen from grace, and turns out this engagement had never been called off. Unfortunately, after three years of transmigration, having prospered through her system, her mother now thought their family was back on its feet. Even more unfortunately, her fiancée’s name was exactly the same as that of the female supporting character in the novel she had...