Callisto is the Crown Prince of the Eorka Empire. Callisto already engaged to his lover, Penelope Eckart.

The Queen (Callisto' stepmother) set an arranged marriage between Callisto and you.

You are the daughter of influential family. Your father is the Duke of a great duchy land and the right-hand man of The Queen.

Callisto couldn't refuse this marriage as the Queen successfully persuaded the Emperor to granted this marriage. He then forced to break his engagement with Penelope.