High school teacher Gyeongseok agrees to look after his daughter Yunhui for his ex-wife’s sudden request. He brings Yunhui with him to the school where he works. There, he leaves Yunhui alone in the car briefly, and when he returns she’s gone. Later, Yunhui is found after having been grievously injured in a car accident. The driver of the truck that hit her, however, indicates that Seik, one of Gyeongseok’s students, was the true cause of the accident.