Ji-suk Yoo is the younger brother of Ji-young Yoo, the head of Shinhwa Association. He is one of the most powerful, if not the most powerful, awakened person in his age group in South Korea. There are only 3 other teenage awakeners in Korea that are able to rival him, adding Woo In as well. Like his sister, his main ability is Aerokinesis. He has attended the Awakened Academy as a representative of Shinhwa Association. (Source: Eleceed Wiki)