Why Mess with Her? She Became the Brooding Villain’s Darling

[Dark, obsessive villain x sweet yet wicked female side character, transmigrate into a book + mutual firsts + multiple men vying for her + an irresistibly sweet romance] After Shen Xingyuan transmigrates into a book, she must push the story's villain, Xu Yanqing, to 100% corruption before she can return to her original world. Before his corruption, the villain has an adoptive father who died in a car accident, leaving behind a mountain of debt; an adoptive mother who abandoned him and fled; a frail younger sister with congenital asthma; and himself, an orphan who has to support the family... He believes he's destined to struggle in the mire for the rest of his life, rotting away until there's nothing left. He never expected to meet someone willing to save him: Shen Xingyuan. If he could, he'd give his life to protect the woman he loves. Gu Bingjun was once a billionaire CEO. In his previous life, he was forced to marry Shen Xingyuan, a scheming, malicious woman. After their wedding, he ignored her and even tacitly allowed others to bully and torment her. Desperate and heartbroken, she realized she could never warm a heart of stone. In the end, she took sleeping pills and died in the arms of the man she loved most, Gu Bingjun. From then on, she appeared in his dreams every night. When his stomach pain became unbearable, there was no one left to care for him. Only then did he realize how much he loved Shen Xingyuan. After an unexpected car accident, he was reborn, back to a time before he had ever met Shen Xingyuan. In this life, he would make up for every way he had failed her before...