He is the younger brother of Ji-Yeong Yu, the CEO 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 a few teenage awakeners in Korea that are able to rival him. Like his sister, his awakened power is aerokinesis. He is friends with U-In, Ji-U Seo and eventually Su-Bin Lee.