Lee Yong Gu is a mentally impaired father with the intellect of a six-year-old, who lives in a run-down house along with his daughter of the same age, Ye Seung. One day, he gets into a physical altercation with the police commissioner, who has just purchased the last Sailor Moon backpack for his daughter, a gift Yong Gu was saving up to buy for Ye Seung. Soon after, the police commissioner's daughter
