YoonA once lived on her princess life until her parents died in a massacre. She's the only child of business billionaire couple Andrew Lim and model turned fashion designer Angel Lim. YoonA's parents died when she was 10 years old, and she was in the care of her aunt Fei and her aunts new husband named David, the step-father of her cousin's Jia and Chansung. YoonA grows up without any knowledge of the wealth and property left by her late parents. At the age of 10, she was deceived and told by her aunt that she's the reason why her parents died. While YoonA grows into a young, fine woman, the treatment of her aunt's family gradually changes. She was treated badly by her cousin Jia and Aunt Fei, and she also received molestation from her aunts new husband, whose David. Junho is a build fine man, his the oldest son of Lee multi-billionaire company that distributed an engine parts for car companies like Hyundai, Suzuki, Honda, Toyota, Mercedes Benz, Ford, and etc. JunHo's parents always ask him to date the daughters of their business partners to strengthen the relationship between the two companies, but Junho always ignores what his parents want. Until one day, he met this mysterious girl named YoonA. She is mysterious for him that her actions are always controlled by someone whose eyes are full of sadness, that he thinks he needs to protect her.