The manhwa likely follows the journey of the saint as they adjust to their new life with the grand duke, maybe facing power struggles and hidden secrets along the way.
The story might focus on how the relationship between the saintess and the grand duke develops and how it shapes her destiny. There could also be elements of magic and power struggles in the backdrop.
It's a tale of an unlikely encounter and the challenges that follow. A saint finds themselves in the residence of a powerful demon duke, leading to all sorts of adventures and conflicts.
Well, it could be that the magic chocolate in the manhwa is a key element that leads to adventures or solves problems. Maybe it grants wishes or unlocks hidden abilities.
I'm not entirely sure which 'the duke' you specifically refer to. There could be many stories related to various dukes throughout history. It could be about a particular duke's political achievements, his family drama, or his contributions to society.
It could be that the duke had something she needed or that she was sent on a mission to interact with him. Maybe it was to uncover a secret or gain important information.
There could be multiple explanations. Maybe it's to protect someone or achieve a greater goal. Or perhaps there's a misunderstanding that's led him to act this way.