Tae Kyung and Baekhyun were childhood friends. They were best friends in fact. But when Tae Kyung moved away to Seoul, Baekhyun was heartbroken. 7 years later, the now 17 years old, Baekhyun has moved to Seoul. At his new school, he meets a girl named Taeyeon and falls head over heels for her. But little did he know that Taeyeon had a secret, she is Tae Kyung. What will happen when the two childhood friends meet again, with only one knowing the other. Will Baekhyun be able to accept Tae Kyung's secret or...

Taeyeon/Tae Kyung(17)

Tae Kyung is actually Taeyeon. Taeyeon was a tomboy when she was young and so Baekhyun mistook her for a guy because of her short hair. Nobody knows about her secret but her (and a few trusted others). Taeyeon is actually very sweet, kind and forgiving. Becuase of this, she is very gullible making her very vulnerable to bullying.

Baekhyun(17)

Baekhyun is the boy next door. He is friendly to everyone and is very caring and attentive. He used to have a best friend named Tae Kyung, but he moved to Seoul 7 years ago. Now that he has moved to Seoul, he starts searching for Tae Kyung again. Little does he know that his friend has a big secret. He also likes Taeyeon, his desk partner.

Kai(18)

Kai is one of Baekhyun's good friends and is the dancing machine of the class. He has a crush on Hyoyeon, and always tries to ask her out but always gets rejected. It is not until he meets Taeyeon that he starts to slowly give up on Hyoyeon.

Hyoyeon(17)

Taeyeon new best friend. She is good friends with Kai since she is on the dance team but only sees him as a brother, this, however, starts to change when she realises that Kai started to like her best friend.