Hyomin is 24 years old and a bright happy girl but one day she became a cold and sad girl.

Kim Jae Won is 28 years old. He works as an ingineur and has a bright personality.

Jae Hee is 28 years old and works at a ship company. 

Kim Yun Seo is 25 years old and works at a fashion company ( the same as Hyomin).

Kim Soo Ro is Hyomin's older brother, he hates to reveal his age. He has three other best friends, they call themself the Gentleman Gang. ( Who knows the Drama a Gentlemans Dignity know what I mean)

Kim Min Jong is Soo Ro's friend. He knows Hyomin really good.

Jang Dong Gun is also Soo Ro's friend and knows Hyomin well. He's also a brother for her.

Lee Jong Hyuk. married and a player. Hyomin used to work as a spy for him. They are good friends.