Transmigrate into a Book as the Sickly Villain: How Do I Save Myself? Help!

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The heroine transmigrates into a book as the villainess and begins pursuing the male lead, who is also a villain, in order to save herself. Along the way, she unexpectedly encounters other male leads and gets caught in a love rivalry. As she spends time with the villainous male lead, she gradually falls for him, only to be misunderstood by him and give her devotion in vain. She goes through the whole process of winning his heart back, while also getting caught up in various incidents. During this time, she stumbles upon the truth, and her mission comes into conflict with her morals, love, and sense of duty. Constrained by the System, she still relies on her own free will to try to save the villain and achieve her own redemption.