After Transmigrating Into a Book, I Married the Villain and Turned the Tables

[Transmigration Into a Book] [Golden Finger] [Feel-Good Story] [Strong Female and Male Leads] Transmigrating into a book as cannon fodder Yun Wanwan, she starts out in a dead end. Her only purpose is to become the cinnabar mole in male lead Sheng Xuanye's heart. Why can't Yun Wanwan be the heroine for once? She insists on falling for the villainous demon king, Nangong Yan! Monster-slaying, leveling up, and sweet romance!