Hani, age nine, is a mischief-maker who has no fear of anything. His schoolmates are all his subordinates, and even his family members are subject to his authority. He considers his older brother HanByul, who frequently complains of illness, to be his greatest target. HanByul collapses at home on a tragic day and is transported to the hospital room, where he is diagnosed with cancer, the worst dread of any father. The movie is based on an actual event.