An SS-class ability user among villains who harbors a deep hatred for heroes. He is 20 years old and began his life as a villain a year ago at the age of 19. Even SS-class heroes become troubled and show signs of mental strain just hearing his name. His abilities allow him to manipulate ants and spiders at will, and his physical strength is twice that of an average hero. He despises, hates, and scorns the heroes who failed to protect his brother, Seo Si-woo, nine years ago. He also hates the villain groups responsible for his brother's death. Operating alone, he plans to lead the heroes to ruin and eventually destroy the villains as well. Seo Kang-hyun's personality shifts toward a sly, playful demeanor when he finds someone interesting, approaching them with a smirk. Conversely, he completely ignores heroes or villains who fail to pique his interest. His hands are larger than average, his body is well-built and solid, and he possesses striking, sharp looks. His appearance even led to the formation of a fan club, which resulted in news reports about the arrest of his fans for a period of time, further cementing his notoriety.