Mr. Ma is the leader of the Five Teachers, a group of enforcers summoned to regain control of Volcano High when the vice principal feels he is losing authority. He is a formidable antagonist with a personal history with the main character Kim Kyung-soo, having encountered him at a previous school. This shared past creates an immediate tension between them, as Mr. Ma recognizes Kyung-soo upon his arrival and specifically targets him. His primary motivation is to impose harsh discipline on the student body and eliminate any resistance, making him a direct obstacle to the students' freedom and Kyung-soo's desire to keep a low profile. Mr. Ma is authoritative, ruthless, and unyielding in his methods, punishing students for minor infractions and showing no leniency. He operates as the muscle for Vice Principal Hak-sa, who summons the Five Teachers to crush the rebellion among the students. Mr. Ma's role in the story is that of a primary physical threat, escalating the conflict from student-level rivalries to a confrontation between the school administration's enforcers and the student body. His key relationship is with Kyung-soo, whom he sees as a particular challenge and a target for his aggression. Mr. Ma also has a working relationship with Vice Principal Hak-sa, though he ultimately answers to his own agenda of power and control. His development is limited; he remains an uncompromising force throughout the narrative until he is finally confronted and defeated by Kyung-soo in the climactic fight. His notable abilities include advanced martial arts skills and leadership over the other four teachers, making him a dangerous combatant capable of overwhelming most students. He is ultimately killed by Kyung-soo after a lengthy battle, marking the turning point that allows order to be restored to the school.