Born with a rare genetic disorder, 17-year-old Ah Reum ages far faster than everyone else. Possessing the body of an 80-year-old, he prepares a gift for his young parents who have raised him with unconditional love. (Source: tvN Asia) ~~ Adapted from the novel "Doogeundoogeun Nae Insaeng" (두근두근 내 인생) by Kim Ae Ran (김애란).