There were a few novels that had the male protagonist transmigrating into the emperor's harem. They were "The Emperor's Queen,""The Emperor's Cute Queen: The Emperor, Too Impudent,""His Majesty Doesn't Love Me: The Evil Concubine Forcefully Marries the Crown Prince,""My Empress Is Mysterious," and so on. Among them,"The Emperor's Queen" was an ancient romance and time-travel novel. The male protagonist was the emperor, and there was more than one female protagonist. It was a harem novel."The Emperor's Favorite Queen: The Emperor, Too Impudent" and "His Majesty Doesn't Love Me: The Evil Concubine Forcefully Marries the Crown Prince" were also ancient romance and time-travel novels. The male protagonist was also the emperor, but the female protagonist was the protagonist. There was no harem content."My Empress is Mysterious" was also an ancient romance novel. The female protagonist traveled through time to become a strong man's emperor. It was not a harem novel. I hope you like this fairy's recommendation. Muah ~๐