Kim Moonhye (19)

A pretty well-off young woman who currently attends the prestigious Seoul University. She is currently majoring in business because she is next in thrown, along with her brother Moonchul, to take over their family's real estate business. She isn't very easy to approach due to her family background. Of the two siblings, she is the serious one. She was taken aback when her parents informed her of her arrange marriage with Jongup. She already agreed to become the heiress to the Kim Corp. and she couldn't understand why she had to marry. After finding out the real reason, she is sympathetic and eventually gives into her parents and the Moon's wishes.

Moon Jongup (19)

The "4-D Dancing Machine" of KPOP band B.A.P. He is currently in a relationship with a TS Entertainment trainee Jung Joohyun. His parents get into a small predicament that ends up with Jongup and Moonhye in an arrangement to pay off debts. He is a bubbly 19 year old living his life to the fullest. He has been going out with Joohyun for 2 years and they are more in love than ever. He is furious with the thought of being married off to a girl he doesn't know but for his parent's sake, he pretends to be happy. Will he be able to warm up to Moonhye?
 

Bang Yongguk (24)

 B.A.P's wacky but responsible leader. He tries to comfort Jongup about the marriage with Moonhye but deep inside he is slowly falling for her instead. He is the only member that knows the real reason behind the marriage. He puts it upon himself to protect her as best as he can without being to obvious.

Kim Moonchul (26)

Moonhye's lovely and protective older brother. Even though he is the older one of the two, he is the least involved with the family business. Through his sister's consent, he continued to become a rock star with his garage band Royal Pirates. He feels indebted to Moonhye because her childhood is basically controlled by their parents while he gets to do basically whatever he wants. He was furious when he was aware of Moonhye's arrange marriage. Him and his band members do everything they can to help Moonhye out of the marriage.

Jung Joohyun (19)

A sweet 19 year old trainee at TS Entertainment. She is very hardworking and understanding. When Jongup told her about his parent's wishes, she immediately agrees to let him go for the sake of his family. Jongup tries to reason with her and tells her to stay with him even though Moonhye is now in the picture. She refuses at first because she doesn't believe that Jongup should be two-timing his fiance but agrees when Moonhye tells her that she is okay with it.

  Best. Absolute. Perfect. (L-R) (Himchan, Jongup, Yongguk, Youngjae, Daehyun, Zelo)

Royal Pirates (L-R)(Sooyoon, Moon, James)