Euna Chae, the youngest granddaughter of a powerful rich family, has it all. Beauty, brains, and wealth. But just as she becomes an adult and expects her future to finally blossom, she's told to get married?! Losing control of her credit card and having to get married is bad enough, but why does her fiancé have to be her sworn-enemy ex-boyfriend?! To protect her marriage (but really her credit card), a secret newlywed life begins at school!