Go Eun Ah (fictional) - Quiet girl who hides behind books, glasses and hideous clothes, but under all these material factors is a strong, intelligent and beautiful woman, both inside and out. She has been in love with her neighbour Jaejoong ever since she can remember, but once she hears what he thinks of her, she decides to come out of her shell and show him the real her, only proving hilarious and surprising consequences.

Kim Jaejoong- the oldest mysterious and silent brother, he is arrogant, foul mouthed and feared by most people. He thinks very little of Go Eun Ah and doesn’t have much interest in girls in general which has to do with his past. Go Eun Ah seems to see something past is cold personality and she has got him confused and he defiantly doesn't see her the way he did. She was no longer the quiet girl instead she was this feisty women who met him at every turn.

Yuri(fictional)- Go Eun Ah best friend and Jaejoong’s sister. She is headstrong and outspoken, even though her and Go Eun Ah were exact opposites, she cares for her very much and will do a lot to ensure to make sure her friends happy, she is a big help and is very kind hearted but also very stubborn.

Jonghyun- Jeajoong’s and Yuri’s brother. He is playboy, he is popular with all girls, and they all throw themselves on him. He is very likable character and everybody likes him. He cares for Go Eun Ah very much and treats her like his sisters, but is also very flirty with her but it’s just his habit. He is the easy going, flirty and funny brother with a smile always on his handsome face.

Nichkhun- The middle brother, he is the mature one; he is the smart one, the brain of his family. He is also adored by the girls but hasn’t much interest in them. He dreams of becoming a doctor and he works hard to achieve his dream. He and Go Eun Ah have a lot in common and she is most comfortable around him. He also has a soft spot for her and sees her for the beautiful person she is. But now he has competition with his brother for her affection and she doesn’t even know he has developing feeling for her.

Anna(fictional)- unlike Go Eun Ah, she is gorgeous and is loved by everybody, she is a model. She is self obsessed and selfish and only care for herself, despite her beautiful appearance, she is very ugly and crude inside and she also has her eyes set for Jaejoong.

Other character introduced later.