To escape gambling debts, Li Su-ho brings his son to a small island, where he leaves him in the care of a childhood friend who has a daughter, In-in. The boy abandoned by his father withdraws into himself. In-yeon manages to melt the mother's frozen heart, and gradually the children become true friends. In-yeon is ill, she needs surgery, and the required amount has almost been raised. Trouble comes when the returning father steals the money intended for her treatment.