Remarried Empress (재혼 황후, Jaehon hwanghu) is a series of webnovels created by Alphatart with illustrated covers by Chireon. The series premiered on Naver's Korean webnovel platform on November 2, 2018. Although there are several websites that have an English translation of the webnovel, none of them are official so character names and events may vary.
"Navier was the perfect empress, however, the Emperor wanted a wife, not a colleague. And so, the Emperor abandoned Empress Navier and placed a slave girl beside him. That was fine, until Navier heard the Emperor promise the slave girl the Empress' position. After much agonizing, Navier decided she would remarry the emperor of the neighboring country."