A young couple, both of whom are 17-years-old, learns that they will have a baby. The couple feels uneasy and they wait for the birth of their first child. Finally, they have a beautiful boy. Their baby is named Ah Reum and the couple learns that he has Progeria syndrome, a rare genetic defect that will cause their baby to show advanced aging from an early age. Ah Reum grows up to become a 17-year-old boy who likes reading and writing. He has the mind of a 17-year-old, but he looks like a withering old man. He becomes interested in a girl his age. ~~ Based on the novel "Doogeundoogeun Nae Insaeng" by Kim Ae Ran.