Oh Sahng Woo makes a living by taking photos of adulterous couples. His long-lost father passes away, leaving him with a huge debt. Totally broke, Sahng Woo locates his half-brother, Bong Goo, hoping to dump the debt on him. What he did not expect: 12 year-old Bong Goo looks like a middle-aged man due to a disease that causes premature aging. What follows is a series of hilarious situations that leads to a heartwarming bond between the brothers.