I Became the Supporting Female Character in a Sweet Romance

Gu Ningshu transmigrated into a book, becoming the male lead's doomed first wife. Second Marriage is a rebirth novel. In her previous life, the female lead, Xu Anran, schemed at every turn to marry Qin Yaoning, heir to the Prince of Qin. But Qin Yaoning had always loved someone else, his moonlight, and their marriage of convenience never brought her happiness. Given a second life, she turned around and married Qin Yaoning's father, the Prince of Qin, as his second wife. The Prince of Qin had a first wife who died young. It was said that the Prince of Qin had loved her deeply. He had sought her hand for days, and their wedding procession had stretched for ten miles. Xu Anran couldn't help feeling uneasy, so the Prince of Qin explained that his stepmother had schemed to bring him and his first wife together. He had felt nothing for her but guilt. The first wife thus became a catalyst for the romance between the male and female leads. Gu Ningshu became that first wife. The male lead is still a young man, and the female lead hasn't even been born yet. She's just a chemistry nerd who worked herself to death pulling all-nighters. What is she supposed to do? Gu Ningshu says there's no way she's dying young. She plans to live to a hundred. Qin Yu says their relationship must be nothing but love. They are a devoted couple, made for each other. *If you're dropping this, just do so quietly. Let's leave each other in peace.* Content warnings: One-on-one romance! Villains of all kinds appear! The male lead isn't a scumbag: he wasn't before, isn't now, and won't be in the future. He has his reasons for marrying the original female lead. This isn't the traditional groveling-after-the-wife-is-gone story. The male lead gets nothing but flowers and applause. Theme: