My Dear Concubines, I Am Really Not a Eunuch.

Modern youth travel through ancient times. They almost get castrated in the cleansing room at the beginning, but are lucky enough to be saved and sneak into the palace. They are a tyrant with no morals, but they have a harem. Let's see how Lin Yang plays tricks from a "little eunuch" to win the heart of a beautiful woman, ascends to the throne, and controls the world.