A theft occurs in the class of Kyung-seok, who is known to be a benevolent teacher. Under the circumstances, Se-ik is accused of being the culprit, but desperately claims it is a false accusation. On that night, the daughter of Kyung-seok who came along to school with him goes missing; suddenly Seik reappears as though he is responsible. However, there awaits another turn of events that opens the question of which one of them is good and bad?