Teach You a Lesson

South Korean Minister of Education and founder of the organization (Educational Rights Agency) tasked with curbing school bullying. Known for his raw, unfiltered public language, he is considered cynical, rude, and unorthodox. Behind his intimidating facade, he harbors deep grief over the death of his only daughter, Gayoon.

As seen in 'Study Group', Choi Gayoon stands out as an intelligent, affectionate, and deeply empathetic woman.

Known for his shyness, stutter, and reserved attitude. Despite projecting an initially weak and serious image, he is an extremely capable character (Deputy Director of the ERA and KAIST graduate) who solves situations through his intelligence and quiet courage.

Distinguished by being impulsive, temperamental, and action-oriented. Trained in combat and protection, she is not the typical reserved protagonist; rather, she acts before thinking and possesses a marked intensity that often leads her to yell or show extreme energy.

Her personality is cold, calculating, direct, and extremely firm. She is a specialized agent who intervenes in schools with extreme issues of bullying and violence. She uses severe methods to fix the system from within, showing great courage and physical power in extreme situations.