The Ultimate Eunuch

Modern doctor Zhao Wuji transmigrates into a fake eunuch in the Jingyang Dynasty. To survive, he plays dominoes, and thanks to his medical skills, he gains the favor of Empress Li, becoming her favorite. He saves the princess who saved the nation, Jiang Ruoran, acquires a treasure from the previous dynasty and the Yin Divine Art, uses Empress Li's power to rise in rank, builds his own faction, and experiments with explosives. Ji An'an tries to expose his identity, but he dodges using the Shou Yang Art and later eliminates Ji An'an with explosives. During the palace coup, he calls in reinforcements to turn the tide, helps Empress Li rule from behind the curtain, and eventually ascends the throne to unify the chaotic era.