Jo Inbeom is the top fighter of the Electrical Engineering department at Guun High. However, he doesn't bully others; he only fights the Automotive department kids to prepare himself for becoming a real gangster. He isn't usually foul-mouthed, but he occasionally uses profanity when he's surprised, annoyed, or angry. When he's happy, he might let out a 'shibal' or two. He often walks with his hands in his pockets and frequently wears sleeveless shirts. A notable feature is his awkward long hair, which he sometimes ties into a small ponytail (mostly when fighting).