Jin-Seong Ha is a High Ranker of the Ha Family and a member of FUG. Jinsung has a carefree and fun-loving attitude, although this also serves as a mask to hide his true intentions. Since meeting Baam, his character has mellowed slightly to the point where he feels regret at the FUG's treatment of Baam. As a member of the Ha Family and one of the top 100 High Rankers, Jinsung is an incredibly powerful High Ranker, extremely skilled with martial arts and incredibly physically powerful, his status heightening the standards one would expect of him. Additionally, even the Elders and Slayers of FUG are wary of angering him, speaking volumes about his strength, with Khel Hellam commenting it was a waste to lose someone as powerful as Jinsung and Kallavan noted that Jinsung is far stronger than Karaka, one of the Slayers. In fact, he is such a monster that Hwa Ryun stated that even a Slayer would have trouble against him in a serious fight.