Kim Jaejoong is known as the fairy tale boy in the eyes of Jung Yunho.

Jung Yunho is known as the stupid y nerd assistant professor in the eyes of Kim Jaejoong.

The two men know each other since they were toddlers.

Yunho loves to tease Jaejoong every time he sees the other young man. As for Jaejoong, he's trying hard to mend his broken heart from Yunho's rejection since he was 15 years old.

"Sorry Jaejoong-ah! I can't date you. You're too young." Was what Yunho had said to Jaejoong, making the teenager's every hope dies that day unintentionally.

But what happen when Jaejoong learns that the man who had rejected him long ago is his fiancé since his birth? And what Yunho must do to have his fairy tale like Kim Jaejoong in his arms?

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Main Characters:

Kim Jaejoong: student in the human and social science, second child of Kim Seungwon, a businessman and Kim Yeseul, an ex-professional model. He has an older sister, Eunhye who is married to Park Yoochun, good friend or best friend of Jung Yunho who knows, and a little baby nephew. He had confessed his love to Yunho when he was 15 years old, while the older man was 21. Yunho's rejection had hurt him a lot. And since then, the young man tries to mend his broken heart the best he can. However, the man being his college professor in the field of history, Jaejoong could never avoid Yunho.

Jung Yunho: assistant professor in the humanities course, his chosen field is History. He is the oldest son of Jung Sungwoong, a cardiologist and Jung Boyoung, a socialite. He has a younger brother, Jung Siwan who studies to be a doctor. He is good friend with Jaejoong's older sister, Eunhye and her husband, Park Yoochun, sometimes his best friend and another time a mere friend. His favorite pastime is to tease Jaejoong, but has a crush on the younger man since Jaejoong was a toddler. He had rejected Jaejoong's confession when the latter was 15 years old. However it wasn't unintentional.

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Supportive Characters:

Park Yoochun: businessman and works with his father-in-law as an assistant project manager. He is Yunho's best friend and is married to Kim Eunhye, Jaejoong's older sister who is an interior decorator. They have a little baby boy who makes them the doting parents they didn't imagine to be.

Park Eunhye alias Kim Eunhye (Yoon Eunhye): Jaejoong's older sister. She is an interior decorator and is married to Park Yoochun. She is a doting sister, spoiling her younger brother too much, her husband's words but Yoochun isn't better. And their little baby boy is the breath of her life.

Shim Changmin: Student in Art course. Being the only son of the most desirable and famous actor in South Korea, Shim Taepyung,  the young man is the most anticipated young actor in his generation. He is good friend with Jaejoong and has a childhood friend in the person of Kim Junsu with whom he is married after his graduation from high school, a marriage which was imposed by his father who lost a bet to Junsu's father. He calls his so-called wife number-freak because of Junsu interest for mathematics.

Kim Junsu: Student in mathematics. Being the only son of the most desirable singer in South Korea, Kim Junki, everyone wants him to take the same path as his famous father. But, the young man prefers numbers than standing on stage, even if he can sing like an angel since he was a toddler. He is Jaejoong's best friend forever since kindergarten and knows Shim Changmin since he was a baby with whom he is married since Changmin's father had lost a bet with his father. He calls his so-called husband food monster and never ceases to claim that the latter has a marital affair with his beloved girlfriend since forever, food.

Jung Siwan (Im Siwan): Yunho's younger brother. He is a medical student in his third year and the one who will inherit the family hospital instead of his older brother. He is engaged with Jaejoong's cousin Kim Hyorin since his first year in college.

Kim Hyorin: Jaejoong's cousin and Siwan's girlfriend. She studies literature in the same college as her cousin. She was raised to be a respectable woman and a good wife. But, she has a tendency to talk like a rough guy when she's too excited with her hoarse voice 24 hours out to 24 and 7 days a week, making Jaejoong call her the boisterous girl.