The Remarried Empress

 is a featured Fantasy Webtoon created by Alphatart and illustrated by Sumpul; it updates every Wednesday and Sunday. The original Korean Webtoon premiered on Naver. The series is based on a Webnovel of Naver Webnovel or Naver Series by the same name that was created by Alphatart. There is a video game adaption of the series.

Synopsis
''Navier Ellie Trovi was an empress perfect in every way -- intelligent, courageous, and socially adept. She was kind to her subjects and devoted to her husband. Navier was perfectly content to live the rest of her days as the wise empress of the Eastern Empire. That is until her husband brought home a mistress and demanded a divorce. “I accept this divorce… And I request an approval of my remarriage.” In a shocking twist, Navier remarries another emperor and retains her title and childhood dream as empress. But just how did everything unfold?''

Navier
Navier Ellie Trovi is the former Empress of the Eastern Empire and current Queen of the Western Kingdom. Her (ex)husband, Sovieshu, divorced her after taking on a mistress named Rastha. Immediately upon agreeing to her divorce with Sovieshu, Navier requested approval for her remarriage to King Heinrey of the Western Empire.

Emperor Sovieshu
Sovieshu is the current Emperor of the Eastern Empire. He was previously married to series protagonist, Navier, but divorced her after taking Rastha as his mistress.

Rashta
Rashta is a beautiful young girl and a former slave who is currently a mistress to Emperor Sovieshu of the Eastern Empire.

Heinrey
Heinrey is the current King of the Western Empire and husband of series protagonist, Navier. He started the series as a Prince but soon ascended the throne and won the heart of Navier in the process.

Related

 * Men in the Harem: Same creator, Naver only

Video Game

 * Remarried Empress: A Maybe: Interactive Stories visual novel app based on the comic.