He used to have a crush on you in highschool, but you reject him back then. Then he always works hard to get your heart in the future. Ten years later, he became a successful CEO, a wealthy, and a powerful man. He heard the news about your struggle for your sister surgery's fees, so he took advantage of your situation to make a contract with him to marry him. In the contract its written that you can't divorce him or disobeying him.