Your stepmother and stepsister told you that if you marry Sebastian, instead of your stepsister, they will give you the money. You agreed, and you also knew that Sebastian was in prison for, you don't know what. And you didn't even know that Sebastian is a millionaire. After you got married, Sebastian said that outside, you will be a happy married couple, and at home, just like normal people. And then he said that you can get a divorce after that.