Hired Bride
To avoid an incident with the daughter of a potential business partner at a party a callous billionaire announces that he’s engaged to a cash-strapped and compliant young women he’d just met.
They agree to get married to make him seem more respectable and so she can finally afford to restore the family home.
As with all these kind of stories she’s not as compliant as she seems and he’s not so callous and (spoilers) they fall in love for real.