No one knew what it feels like to be her, Im Yoona. Everyday life wasn’t all flowers and glitters for her, having to work hard at such a young age, supporting her younger sister, studying her off to get into the university but what did she get in return for all her hardwork? Getting framed into a crime that she didn’t even do.

Jung Jessica, a daughter of a rich businessman who happened to have an interest in the young girl decided to help her out and take her into the Jung Household.

Krystal on the other hand, is Yoona's younger sister whom Yoona is overprotectived with. What's funny is that even though these two are siblings, their real feelings for each other are probably... a bit more than that. 

Kwon Yuri, is the private detective hired to solve Yoona's case. She seem to have a bad history with Jessica and has a love-hate relationship with the latter.