Si Woo is convinced that Soon Duk had ulterior motives when she helped him. Soon Duk feels somewhat responsible for the situation Si Woo is in and tries to help him. Meanwhile, Chi Ang and Si Woo are assigned to the introductory class and are given tedious chores to do. While doing these chores, their emotions get the best of them and they get in a fight.
Chi-Ang et Shi-Woo sont de corvée de nettoyage mais les garçons n'en font qu'à leur tête. Exaspéré par leur comportement, le directeur Hwang leur propose un dangereux défi ; seul celui des deux qui réussira la mission pourra rester à l'école, l'autre sera renvoyé.
