The Fake Eunuch in the Imperial Harem

Li Wei used to be an ordinary office drone, working nine to five. One morning, he wakes up to find that he's become a fake eunuch. After catching the empress and the great general in an illicit affair, he lands in big trouble and is sentenced to death, but the princess saves him.

However, the princess discovers that he's a fake eunuch. To save his life, she orders the protagonist to provide a child for the crown prince, but this drags him into an even greater storm...