CEO's Naughty Little Wife

Mary is the naughty and spoilt daughter of the wills family who is still in university and enjoying her life freely when she is given a letter by her parents saying that she had to get married as soon as possible and give them a grandchild unless her wealth will be given to her devious half-sister. with no one else to turn to for help, Mary seeks help From her childhood enemy/nemesis and they get married through a contract that says; 1) you will only consummate your marriage once a month. 2) you will deny your marriage in public but accept it in the midst of his /her family. 3) if either he/she falls in love with someone else, he/she is allowed to annul the marriage after performing his or her roles. 4) if after one year and no progress he/she can choose to leave the marriage......... how will Mary survive being the naughty wife of a devious CEO, who doesn't have any thought of ever letting her go again?