My Brilliant Life

Mira and Dae-su are 17 years old when Mira becomes pregnant. After Mira gives birth to a baby boy, Ahreum, they learn that he has Progeria syndrome, a rare genetic disease that will cause him to age prematurely and rapidly. 17 years later, sensing he doesn't have much time left, Ahreum starts to write a story about how his parents fell in love, hoping to give it to them on his 18th birthday.