I Married the Villain After Transmigrating into My Own Novel

Author Xu Qing never imagined she'd wake up inside her own web novel—as a side character tasked with an impossible mission: reduce the villain's darkness points before he destroys everything. The catch? He's already lived this life once and remembers how it ends. Now she's trapped in a deadly game of cat and mouse with a reincarnated villain who knows all her tricks, and her only way out is to... marry him?! Can she rewrite fate when her target already knows the ending?