A simple girl Y/N (your name ) who needs money to save her brother ends up marrying a mysterious person who always have a mask over his face . All she needs to provide a baby to her husbands under a contract for one year. All she knows about him is his name Jin and he lives in a huge mansion . What will happen with her after her marriage? Will she be able to give him a child? Will she ever know about him ? For further information read the book .