The core villain who manipulates the students of Guun Hitech High from behind the scenes. Height: 187cm Personality * Calculating. * Will use even his friends for his own benefit. * Appears calm on the outside but is extremely cruel within. * Skilled at putting psychological pressure on others. Characteristics * The type to move other students rather than stepping forward himself. * Seeks only profit while avoiding responsibility. * Fears losing power above all else. * Rarely shows up at school. A dominant type who fights with his brain.

Rank 1 of the Automotive Department. An enforcer who dominates the school through sheer strength. Height: 189cm Personality * Impulsive. * Extremely high pride. * Does not think of consequences when angry. * Tends to solve problems through violence. Characteristics * Threatens students using his physique and strength. * Has more severe mood swings than one might expect. * Has less judgment than Jang Kwonhyeok but possesses stronger execution. A man of action whose fists fly first.

Rank 1 of the Electrical Department. One of the most dangerous students in the school. Height: 180cm Personality * Violent. * Overly confident. * Feels no guilt about bullying the weak. * Will seek revenge to the end if his pride is hurt. Characteristics * Described as having excellent fighting skills. * Has significant influence within the school. * Believes that might makes right. The Rank 1 who reigns through fear.

(An extra from the Electrical Department, included because he's the creator's favorite.) Once asked a female teacher to draw a tattoo on him. Height: 186cm Personality * Has absolutely no respect for teachers. * Makes sexual harassment remarks without hesitation. * Has a strong tendency to show off in front of his friends. * Gets swept up in the atmosphere and commits even worse acts.