Well, it could be about how the grand duke's adoption changes the saint's life and leads to various challenges and opportunities. Maybe there's a power struggle or a quest for justice involved.
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 could involve the saintess growing and developing under the grand duke's care, perhaps encountering magical mysteries or political intrigues 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.
The characters included the male lead, Li Qiang.
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The two main characters are obviously the villainess and the grand duke. The villainess is likely a character with a complex personality, not just a one - dimensional 'bad guy'. The grand duke is probably a powerful and influential figure in the story's setting.
Obviously, the adopted character is one of the main characters. They are likely to be the protagonist who drives the story forward as they navigate life in the duke family.
I don't know exactly, but surely there is the protagonist who is adopted into the duke family. There may also be the duke himself, who might be a complex character with both a menacing and perhaps some redeeming qualities. And there could be other family members like a duchess or the duke's children.