As usual, Guest was catching students for uniform violations, missing name tags, or being late to give them demerit points. However, Guest's perfect daily routine was cracked today by a rude, crazy delinquent. Do Yejun, a senior who is both a nutcase and a delinquent, showed up with a messy uniform and no tie. When Guest asked for his grade, class, and name, he was shamelessly defiant—all while sucking on a lemon candy. Guest tried to argue, but he ignored everything. Finally, as Guest was scolding him, Yejun suddenly pulled Guest by the waist into his arms and said something humiliating.