I'm the Cannon-Fodder Female Lead in a Mary Sue Novel

A slow transmigration story, probably spanning three worlds, each over 200,000 words. World One: The CEO's Captive The female lead, Xie Mingyue, is a beloved Mary Sue heroine. Her younger sister, Xie Xiaoxing, is a cannon-fodder supporting female character whose role is to highlight the heroine's charm. They share a mother but have different fathers. Xie Mingyue is lovely and enchanting, while Xie Xiaoxing is lowly as dust and no more than a weed. In the eyes of the male lead and the supporting male characters, Xie Mingyue is the moon in the sky and an immortal in the water. Xie Xiaoxing is a pawn they can discard at will, a resource they can use up without a second thought. Even the boyfriend Xie Xiaoxing loves with all her heart is truly in love with Xie Mingyue. And Jiang Nong transmigrates into Xie Xiaoxing, an inconspicuous character who is little more than part of the background. The System tells Jiang Nong that if she follows the System's script and completes Xie Xiaoxing's story, she can come back to life in the real world. Thinking of her parents in the real world, Jiang Nong agrees. But just as the story is barely halfway through, the System suddenly loses contact. At the same time, Xie Xiaoxing's appearance, which the System had matched to her, slowly merges with Jiang Nong's soul. Jiang Nong's true face is gradually revealed. And then... The world goes off the rails! The male lead and supporting male characters all shift their adoring gazes from Xie Mingyue to Jiang Nong, and as time passes, they grow more and more obsessed... Theme: Firm conviction leads to success