Lee Sungmin is a fifteen-year old, incoming freshman, who will attend Seoul High School. He is an outstanding dancer and always tries his best in everything he does. However, for odd reasons unknown, he has been falling more often and recently, been walking stranger. When he took off to take his entrance exam for high school, he fell, badly injuring himself. Along the way, he continued to fall until he met a strange boy the same age as himself. The person took Sungmin to Seoul High School to first, clean his injury, and second, allow Sungmin to take his exam. Eventually, Sungmin's mother takes his son to a hospital to get to the bottom of these odd occurences. What if, in the end, they are informed that Sungmin acquired a disease? Not just any disease, one that can't be cured? How will his life change? How will he live? Most importantly, who was that person he met?