Jung Hyemin being the only daughter of Jung family. The Jung family is very known for their expensive jewelry and most beautiful jewelry you ever since. But unfortunately Hyemin have involve into a accident when she was only 10 year old. She have a long term amnesia. Even though she is 17 year old but her mind is only 5 year old girl. She have no fear cause she think she only a little girl. Nobody ever hurt her, if you do I bet there thousand of bodyguard waiting to kill you when you sleep.

Byun Baekhyun is the famous Seoul Prince, which every girl fell on their heels for him. He is the crown prince, soon-to-be-king. Everyday he get thousand of love letter in his locker. If you think a prince should be kind and honest you were wrong. Baekhyun is a playboy in the school. There are countless girl that he had slept with. Because it his habit or should we call addicted to 'that kind of thing'. The king and queen already knew about this that why they have a arrange marriage for him. And the girl is no other than Jung Hyemin.

"Mom, she just a 5 year old girl. You expect me to marry a kid?"

"Eomma, who that handsome Oppa? He steal my teddy bear and throw it away!"