20-Year-old Yu Yu lived in a happy family and was recognized as a top student. However, he was plagued by illness and eventually died at an age as young as a flower. Qiaoxi, 15 years old, is an orphan. He has never been ranked first in school since he was in school. He is the top student among top students. When 20-year-old Yu Yu becomes 15-year-old Qiao Xi...