Key, son of The Kim Company's fonder and head manager. He is 18 years old guy with hundreds fans on his school. He's popular because of his money. Of course, he is a successful guy and a perfect man to marry with, even though he has not entered his college yet. He took his elementary in Los Angeles, Junior High School and High School in Seoul International School. Really, he is a rich boy. It's like his future had already predicted him to be a perfect man.

But, to tell you the truth, he can't even handle his father's company. It's not his dream.

Shin Hae Rin, an 18 years old girl and she lives with her twin, Shin Hae Ri. Their parents left them when they were 10 years old, due to the crisis of economy. Until now, she works very hard for the sake of their life. She has all of the beauty that everyone could see through her kindness. But well, even though there are lots of guy who wants to be her boyfriend, she refuses it all. She's deeply in love with someone................and that lucky guy is Key.

It's their fate to be together when she knows that Key loves her too. They were a classmate since 5 years ago, and their relationship still remains until now. But whenever Key propose her to be his girlfriend, she always says no to him. It's strange, but they are fine with this kind of relationship. Maybe there are times when they feel uneasy, but they've handled it for 5 years. Key can't persuade her to be his girlfriend, after all.

Shin Hae Ri, Hae Rin's lovely twin. A little bit paranoid, but she knows how to cook very well. She has a Mom's character and very understanding like a Dad. She's a mature 18 years old girl who has a heart like a tenderloin steak. 

Lee Jinki, a very simple 20 years old guy who works in a coffee shop. He doesn't want to enter the collage. He lives by himself, and he has no relatives. His parents died 8 years ago because of an earthquake.
 

Lee Taemin, a cute 16 years old guy and he likes to eat a lot. He lives with Jinki because his parents are in Australia. They are a good friend since elementary school, and now Taemin has his own little business while Jinki works in a coffee shop. Just guess now and be patient to discover what business that he owns.

Choi Minho, a cool and handsome guy who works part time job as a teacher in a kindergarten school. He's only 18 years old, but believe him, he has been through a lot.

Kim Jonghyun, Key's best friend. Because of his fame, Key can't easily make a friend with an ordinary people. They are all have to be rich, or extremely smart. Jonghyun's grandfather is one of the world's most famous designer. But he, himself, isn't famous at all. He is a naughty boy but also sweet guy at the same time. This 19 years old guy really need to learn how to handle the difficulties, obstacles, and problems in his life.