...knowing martial arts.? The main character (a boy) knows martial arts from his mother, who was a karate master. The boy has a sister who knows no karate at all, but he has friends that knows kung fu, kendo, etc. It was popular during mid to late 1980s. Anybody know what I'm talking about? I think the main character's name was Han JuMok (One Fist, literally translating it) but that's just a Korean name, and the Japanese name might have been something else.