Kim Hana, a girl with a bright personality can make anyone fall in love with her. She really friendly with other people even she barely know them. Her brother, Kim Hyun Joong, who are really protective over her will always keep her safe and even avoid the guys who want to woo Hana shut their way out to flirt with her sister. Hana also had a big crush with her big brother's friend, a.k.a her bestfriend oppa, Kim Kyu Jong. Just because she feel shy, Hana never confess. One day, she hope that she can confess her feeling toward Kyu Jong.

Yoon Dujun, the boy who always tease and keep fighting with Hana but always protect her from other people. He had been friend with Hana since they are still kid along with Kim Kyu Jong. There are secret that Dujun save for himself and he don't want to tell anybody even to Kyu Jong just because he don't want their friendship are broken. The truth is, he really like... nope.. love.. yes! He really love Hana but in secretly.

Kim Kyu Jong, reliable brother to Hana and Dujun. Even they are not related by blood, but he really love them like his own sibling. Well, maybe because he is a single child in the family, he really treasure them. He start to know Hana when her brother brought him to his home for study together. And after that, he got to know Dujun when both Hana and Dujun are playing together. And from that moment, they become bestfriend.