Main plot: I transmigrate into an ancient alternate-world novel as Su Wanzhao, the villainous concubine-born daughter. In the original story, I fail to poison the male lead, Gu Zhaoheng, on behalf of my legal mother, then get tortured to death by my lovesick, concubine-born younger brother, Shen Yanqing. Gu Zhaoheng is also killed when Shen Yanqing plots against him with the same poison. After being reborn, I use my memories of the original book to switch the poison and save Gu Zhaoheng, only to discover that he already knew about my plan and had been secretly protecting me all along. As I investigate further, I uncover the truth behind Gu Zhaoheng's poor health: when we were children, he took the poisoned porridge meant for me to protect me, leaving him with a lifelong illness. Shen Yanqing's schemes go far beyond that: he intends to destroy the Gu family, and I have become a thorn in his side. As Gu Zhaoheng and I test each other, we gradually fall in love, but Shen Yanqing's plans repeatedly put us in danger. In the end, I use evidence from the original book to expose Shen Yanqing's crimes, save Gu Zhaoheng, and save myself. He proves with his life that he had long since kept me close to his heart.
