18 years old. One of the YB quartet. He was a second-year student in the Automotive Department, Class 10, at Incheon Yooseong Technical High School, but has since been expelled. He is the son of YB Executive Director Ma Cheondeuk. Height: 173cm He is characterized by navy blue hair, amber eyes, and ear piercings. He possesses exceptionally handsome looks. While he appears to have a cheerful and bright personality, his true nature is that of human trash who betrays or abandons those who show him genuine goodwill for no particular reason, or uses victims of school violence by pretending to help them purely for his own amusement. He is a peerless psychopath and villain in every sense of the word. He is a cruel individual who enjoys dragging both perpetrators and victims into the abyss just for fun, and he has committed murder using a firearm. As the second-in-command of the YB quartet, he possesses significant fighting skills and instincts utilizing Gun Kata. Gun Kata: A martial art involving the use of firearms in close-quarters combat. He is sensitive to the cold. Surprisingly, he was said to be quite diligent when he was still in school.