Teenage Mercenary

When Ijin Yu was eight years old, he was the sole survivor of a plane crash. Having lost his memory, he was forced to live as a mercenary in a foreign land in order to survive. One day, Ijin regains his memories. After bringing his ten long years as a mercenary to an end, he returns home, reunites with his family, and enrolls in the same high school attended by his younger sister, Dayun. From bullies and delinquent students to street gangs and organized crime groups, Ijin faces one unreasonable threat after another. To protect his beloved sister and his friends, the former mercenary launches into an exhilarating action-packed battle.