The Second Eunuch Regains His Manhood is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

The eunuch Lee Cheolsu, a secret power figure who controls the affairs of the empire at will. He possesses absolute power, wealth, and even strong martial arts skills… but what does that mean? If he can’t “do that”!! Through a reincarnation technique, Cheolsu returns to the time before he became a eunuch. He has one goal in mind: to become an alpha male and enjoy life with the most beautiful women!! A full-fledged 15+ rated(?) comic martial arts story about Cheolsu, who lives purely for his desires, begins!