18 years old. One of the YB Four. 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 a piece of trash who betrays or abandons those who show him pure goodwill for no particular reason, or uses victims of school violence by pretending to help them purely for amusement. He is, quite literally, an unrivaled psychopath and villain. He possesses a vicious personality that enjoys dragging both perpetrators and victims into the abyss solely for fun, and he has even committed murder with a firearm. As the second-in-command of the YB Four, he possesses significant fighting skills and instincts using Gun Kata. Gun Kata: A martial art involving firearms. He is sensitive to the cold. Surprisingly, he was said to be quite diligent when he was at school.