The Sick and Weak Emperor Ji: I Rely on Poison to Gain Power.

Being stigmatized as a "Lone Star" and regarded as an abandoned son by his biological father, Feng Zhiwei married King Rui of Zhou Dynasty in order to make peace with her. In front of others, she is a weak and easily bullied concubine, but behind others, she is a plan-maker who has no plans left. The undercurrent in the palace is turbulent, the queen and the noble concubine are eyeing each other, the battle for the throne is intensifying, and Dayan's secret guards are pressing forward step by step. She uses her illness as a shield and resourcefulness as a blade, leveraging her own strength to fight for her success, and maneuvering around the various forces. She investigates old cases of family extermination, solves palace conspiracies, and resists the emperor's control. She never lets anyone manipulate her. An orphaned girl, relying on her own scheming and scheming, will finally change her fate against the will of heaven and take charge of the world in the turbulent court and harem!