You're a brilliant girl. You're just 17 and already graduated from high school in US. Your parents got divorced. While your big brother Onew stay with your mom in Seoul, your dad took you with him to US when you're only 4. You took 3 times acceleration class, and become the youngest graduate there. You're planning to enter a great college in US but suddenly your father passed away. Then, your mom called you and told you to move back to Seoul. You told her about your dream but she disagree, she wants you to be a nurse, because Onew who's 4 years older than you is now entering the School of Medicine and going to be a doctor soon.

You're feeling sad about your life when you met your brother's friends, Jonghyun, Key, Minho and Taemin. While you're busy to catch and fight for your dream, they give you a lot of attention you've never felt before. One by one they started to fall for you, but in your heart only one person you really love. One day a fortune teller told you that only one of them truly loves you and your choice will affected to your future and your dream. But who will that be? Jonghyun the young businessman? Key the fashion designer? Minho the football player? Taemin the great dancer and used to be your friend in kndergarden?