One World: Two Empires: Serenity

Illuminia and Melania: Illuminia is the place of light. Everyone has lightly colored features and clothes. Melania is the place of dark. Everyone has dark colored features or clothes. An alliance was formed by the two empires long ago and have since lived in harmony beside each other. However, there's one rule. Do not intermarry, do not produce offspring together. That is highly forbidden, and so is any type of romantic feelings.