Characters:

A senior in high school with a goal of attending college and becoming a successful businesswoman like her best friend. Growing up an orphan under the roof and care of her unnie's parents, Hara's life was greatly influenced. Gaining popularity at school because of her attractiveness and sweet personality, she has a bunch of friends who love and support her. Hara was not interested in boys; despite the attention and her advantageous beauty. She especially despises bad boys; until she met Ok Taecyeon. At first sight, Hara was intrigued. But after meeting him, she was immediated turned off by his attitude. As time grew on though, an unexpected encounter with him has her thinking differently.

He is part of a gang on the streets that remains anonymous. His parents kicked him out of their home for causing misfortune to them. Taecyeon lives in a litttle apartment with a friend. His adoptive guardians strongly encouraged him to go get an education and live a 'happy' life. Taecyeon, not understanding the importance of school, just went along with it. He ended up attending the same school as Goo Hara. The pretty brunette caught his eye when he unexpectedly recognizes her from his past. Now Taecyeon finds himself trying to get her attention, melting away his cold image.

'Woo' is his nickname. He is Hara Goo's best friend. Taecyeon apparently has a rough, unknown history with him. Woo wants to be able to protect Hara and become her knight in shining armor, though she only thinks of him as an oppa. He strongly dislikes Taecyeon and doesn't approve of Hara's friendship with him. 

'Dara' for short. She is Hara's unnie and caretaker. Graduated and finished from beauty school, Dara is a well-known model and CEO for hair and makeup products. People cherish Dara for her youth at the age she is. When Hara had nowhere else to go, she took her in and has become like a sister to her since then.

He is the friend whom Taecyeon stays with. Though Junho joined the same violent gang as him, he still remains loyal to his own parents; even if they are oblivious to the fact that their son is in a group full of criminals his age. He enjoys going to school with his best friend, but Taecyeon is starting to lose his cool reputation to Hara. As a result, Junho develops hateful feelings toward the girl and messes with her in any way he can.