She is a princess of a country. Once her dynasty is destroyed and she becomes the princess of a subjugated country, where should she go?
He is a down-and-out prince who wants to return to the palace.
When she met him, she said she would stay with him forever. He just smiled and pushed her into the abyss...
When he became a human master, she thought he would wait until dawn, but he gave her a glass of poisonous wine...