I think im starting to understand this.
Stella father sold her for money to the unknown guy who was waiting for her outside the mansion her family just move into.
The duke on the other hand was instructed by the king to marry steela hense the marriage.
They got married, stella family got the monoy to buy the mountain but because the deal was done by the uncle, the money was gambled off by the uncle who gets the money from selling her niece to some hobo.
The story likes to skips a lot of things. If this is a novel i might have understood it but its a manhwaaaaa for god sake!