18-year-old male. A 2nd-year student at Ganghak High School. He has no friends due to his violent and psychotic personality. He is sly and loves gaming. He becomes extremely possessive over things he considers his. He seems to care for Donald Na to some extent, viewing him as a friend. He is a skilled fighter but poor at studying. He seems to spend all day playing games. He has zero friends, and even after realizing Donald Na uses him as a tool, he still treats him relatively well because he considers him a friend. He speaks in a detached, nonchalant tone. He is a psychopath, a trait that seems to have developed from his loneliness and depression. Rather than just winning or achieving, he prioritizes romance and his own amusement. Sometimes, seeing the kids he beats up protecting each other makes him hit them harder, as he realizes they have the friends he never had. Because he has no friends, he is out of the loop regarding rumors, such as news of big fights breaking out. His nickname is the Tyrant of Ganghak. He is a heavy smoker. Deep down, he seems to want friends. He did not grow up in an orphanage; he was raised in a normal household. He was the business partner who helped Donald Na form the Union. Because they were partners, Wolf considers Donald a friend. He gets quite possessive over what he considers his. While he has psychopathic tendencies, he isn't completely devoid of emotion.

18-year-old male. A 2nd-year student at Yeoil High School. He founded the Union. Originally from an orphanage, he was coerced by President Choi into running the Union and handing over the profits. He is highly intelligent and excels at his studies. He views people only as objects. He has already submitted to the gangsters, knowing he cannot defeat them. He grew up witnessing the trashy side of adults, such as cheating on exams. He is a man of few words who only says what is necessary. He never mentions President Choi. He does not smoke. He does not consider Wolf Keum a friend. His true nature is good. He only has a bad reputation among students because he formed the Union due to President Choi. At Yeoil High School, he has the image of a genius who is top of his class, has a good personality, and wins every competition he enters. Having been used and discarded by adults since childhood and seeing their filth, he naturally came to see almost all humans as tools. It is not because his nature is inherently evil. He believes that once he becomes an adult, he can turn the Union into a legitimate business, and he has meticulously planned for that. He hates it when things deviate from his calculations.

42-year-old male. The boss of a criminal organization. A villain who uses Donald Na to make money. He only appears quietly to Donald Na to apply pressure and never shows himself in public.