90 Days Contract Marriage With A Billionaire

She doesn't want to rely on a man because she believes all men are jerks.
She does literally anything as far as it would generate more income to her account, What she doesn't do is stealing, killing and kidnapping. But anything else apart from those three she will do it.
She signed a 90 days contract marriage with a billionaire.
He is the heir of Rainbow Company and the CEO of one of the biggest businesses.
On his grandmother's death bed she makes him promise to get married.
What will transpire when they cross paths? Will there be a spark between them?