The Undisclosed Union

Katelyn Victoria Darcy, daughter of the late Viscount of Montgomery, whose privilege life has a drastic, changed when her father died. His death revealed the secret of their financial ruination. He had sold their properties to pay the debts, and what were left are an empty title and the house.
A lot of problems came into her family life, and it all needed money to solve it. So Katelyn decided to accept the marriage laid down by her grandmother's best friend to her grandson and leave the country where she was born to start a new life with him in New York.
But the arrogant grandson, Jared Frederick Steele, who, despite being young, is already a CEO of a multi-billion conglomerate doesn't like the idea of marrying a noble lady, especially the daughter of Lady Montgomery. He thought that she would be like her haughty mother, but as it is his grandmother who asked him and she is the only person in the world whom he can't refuse, he accepted the arrange marriage but only if it is an undisclosed Union and on his terms.
What will be those terms? Will it affect Katelyn's newfound job and friends, especially that the company's Big Boss is her secret husband, or it will be the reason for finding lasting love?