Following the vice principal's direction against corporal punishment, the dean of students, Kwang Do, resorts to excessive use of penalty points, causing significant conflict with students but eventually improving the penalty system.
On a "green day," a day without penalty points or corporal punishment, students behave indiscriminately, greatly disappointing Jae Ha, the English teacher, and Min Ju, the Korean teacher. Amidst this, the students of Dongkwang High School protest against corporal punishment
