Kim Yoomi (You) - A beautiful 16-year-old girl who lost her parents in a tragic fire when only 7 years old, she wasn't taught about how to take care of herself, and she didn't remember anything about her childhood, but she's got a very smart mind and mentality to get around things in certain kinds of ways, and that is how she survived. While growing up as a poor homeless orphan, she was also helped by tons of generous groups and communities coming to care for the needy ones. That time, she learned how to hope for things that come for the best, and how to know that generous and humble people exist. One person said to her one day, "Hope is something much better and stronger than fear". Motivated and inspired, she kept on moving on to live out a full life, at least.  She's pretty much used to that routine everyday, and that is until one day, she's taken in by Jo Youngmin to enter the life of his twin, Jo Kwangmin, both members of the famous boy group, BOYFRIEND. Now it's the day of the milestone, when she turns from homeless, to the luckiest girl on Earth.

Jo Kwangmin - Seems rude, stubborn, careless, and ignorant at first, he seems to care about the daily people and things in life. He just usually gets things over with, so he can just relax and be lazy with no stress at all. But he gets annoyed at first by the beautiful but homeless Kim Yoomi, who moves in with him and his twin, Youngmin, as well as the other Boyfriend members, as for Youngmin's idea. His feelings change when he finds clues to the actual truth, and later, he begs for Yoomi's forgiveness. He had his lessons learned when his own personality changes, and learned that his first impression on Yoomi was wrong.

Jo Youngmin - Unlike Kwangmin, Youngmin is very generous, humble, and very giving. He is full of happiness as always, and very mature. He finds Yoomi on the grounds of Starship Entertainment, and decides to provide her shelter. He is even nice to his brother, although Kwangmin seems to be the opposite of him. Gets along very well with the other Boyfriend members, and loves his career as being a member of Boyfriend.

Go Minyeon - Has a pretty doll face, but an evil mind. She hates and gets jealous of Yoomi, and tries to seduce the Jo Twins away from her. She even hates Boyfriend, but Boyfriend is so popular, she just tries to get close to them. Very sneaky and selfish, she wants to become a Hallyu star. Minyeon does whatever to get close to Boyfriend just to get attention.

More characters to be introduced in the story...