A couple of teenagers have a son who suffers from progeria, a rare genetic disorder which makes one age exponentially faster than normal. 16 years later, the child has the body of an 80 year old in the final days of his life writing a book about his parents' love story.

casts

Song Hye-kyo

Gang Dong-won

Jo Sung-mok

Baek Il-seob

Heo Joon-seok