After watching this film, the title Good Person does not seem to indicate an ethical being; rather, a question of what it is to be good and how it is made. 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 daughterof 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. Good Person throws this bewildering question through a well-structured storyline and a detailed portrayal of emotions.