[Machine Translation] A mentally handicapped father with the heart of a 6 year old and a solid 6 year old girl. This is a miraculous story of a father and son behind bars, presented to all adults who have forgotten their dreams. The film was nominated for 12 Daejong Awards, the most in its history, and won 4 awards, making it the 3rd most-watched Korean film of all time! --In the spring, she goes to school with a yellow school bag. A sudden incident casts a shadow over a father, Yeong-gu, who is six years old intellectually, and his daughter, Yesun, who is six years old and very strong, who was dreaming of her daughter's entrance ceremony. Yeong-gu is arrested and imprisoned for murder. The daughter is alone and lonely, thinking of her father, while behind bars, the father longs to see his daughter. One day, the cell leader of Cell 7, who was saved by Yeong-gu, and his friends decide to infiltrate Ye-sun's cell and carry out a major operation! However, their happy time together does not last long... In the final argument of the trial, Yeong-gu somehow pleads innocent at the last minute. Years later, Yesung becomes a lawyer and works hard to prove his father's innocence. And what his father really wanted to protect is revealed...