Yeongsil

Yeongsil was the number one Taekwondo master of Jushin. He was the first to notice Aji Tae's abilities. He once worked for Aji Tae after the fall of Jushin, but defected like Eul Paso and now lives in Mt. Chilgap, working to become a blacksmith with Mito. He is very interested in technology and developed some unusually weapons such as his protective armour and the custom machine handgun that was originally Munsu's revolver gun. He did help design something useful such as Munsu's new coat that is resisted to heat and holds grenade ammo. He also helped restored part of Tae Yu's lost limbs with a metallic one. During Jushin, he invented a telescope and coincidentally used it to spy on Aji Tae, thus discovering his ability to sense people looking at him from far away. (Source: Wikipedia)