Depicts the solid friendship and sincere love story of 18-year-old youths who cannot give up love or friendship. The drama deals with the unique subject of cellular memory, which hypothesizes that memory is transferred to organ transplant recipients. Go Yoo is an 18-year-old student in his second year of Hara High School. Go Yoo grows taller everyday, and he is often praised as a genius at basketball, which he originally started in order to grow taller. He's also a charming student who manages to at least do averagely in school despite not studying. Go Yoo is too busy to date, and he's preoccupied with protecting Joon Hee, but after he donates his kidney to Joon Hee, he becomes rivals in love with Joon Hee for the school's No. 1 student and his first love So Yeon due to cellular memory syndrome.