Transmigration: From the Start, I Was Wu Dalang, and I Poisoned Pan Jinlian

Li Guodong spent his whole life dividing all his savings among his three children. In the end, he got cancer, and his children dumped him in a nursing home and ignored him. Just as he thought his life was about to end in regret, a transmigration System appeared. He transmigrates into Wu Dalang, and if he can successfully poison Pan Jinlian to death before she poisons him, he will be cured of cancer, gain more years to live, and get the chance to win the lottery. Li Guodong's fate changes from that moment on. He is going to make his three unfilial children pay...