A girl, named Kim Hyejin, an intelligent of the school, had a mysterious memory of her pastlife. She doesn't remember anything, only the time when both of her parents died on an accident where she and her brother only survived but the thing is, she separated with her brother when they both were sent in different orphan house. Now, she lives with her adopted family in a big mansion but then an unexpected boy came to her life, changing everything to her life and finally discovered the mysterious side of her pastlife including her long-lost brother.

    She's not a typical nerdy though, a beautiful intellgent girl, that no one ever acknowledge her beauty. Despite being the not-so-famous girl in the school, she managed to get 1st place, in every examinations and the most important part is, she managed to stole the heart for a guy; an unexpected guy ever.  

"I must find my brother, I miss him so much."

- Kim Hyejin

but there is only one guy always saves her; her guardian angel and that guy is the most favourable guy, in the school ....