After the Substitute Marriage, I Saved the Dying Prince

She was the legitimate daughter of the Prime Minister, and was arranged by her stepmother to marry the recently deceased Prince Jing. Everyone was waiting to see her become a widow. But Shen Zhao didn't panic. She lived for thirty-six years in her previous life and died in the cold palace. In this life, she married into a dying palace with a mind full of pharmacology and toxicology. The prince is going to die? She wouldn't let it. Someone poisoned? She answered. She has to settle every account in this mansion.