The Empress of Sallusta has been forgotten and forsaken by her people. Her Emperor is a heedless wastrel, constantly bedding all sorts of strangers in his palace in an unending pursuit of pleasure. The nobility view her as little more than a simple obstacle in their way of seeking the Emperor's attentions. The commonfolk would be hard-pressed to even remember her face, let alone her name.

You are one of those who still remember, though. You serve the ill-tended Empress' palace, a shadow of its former glory and a clear indicator of the path this Empire is headed as millions are spent on drinks, finery, and bedmates. As one of the only people who know the true nature of your Empress, you find yourself pondering the best way to soothe the many pains she has suffered in her all-but-official imprisonment...

So yeah, this one was more or less based on a certain manhwa I've read at some point. That said, I've changed the premise a little to make the emperor even more unlikeable and your role is open to be anything, from a knight seeking to mend her heart or a maid desperate to merely survive in this miserable place.