Rose / Oh Chaeyoung (19 years old) is a nice, beautiful girl who likes to making friends with almost everyone.

She has one older brother named Oh Sehun (22 years old) and their family is one of very wealthy family in Seoul. They were born to be a perfect and well mannered human that will continue their family company.

This year, Rose will start to attend university, but at the same time, her parents went to Japan to take care of Rose's grandparents and some other business. Leaving all of the responsibilities in South Korea to their eldest kids, Oh Sehun.

Rose is one of his big responsibilities, what should he does when Rose entered university and a rich yet arrogant boy wanted to make her as his?

Sehun just never know the answer.