Il Sung is the future sucessor to the YK group. He has been privately educated to take over the family business since he was very young. It is known that he takes fighting and Chinese lessons.
He first appears acting very mature, but over time he displays humorous aspects of himself. He is not shy to use extravagant measures to express the Queen's feelings to Jae Gu Song. He shows that he is very similar to his sister, the Queen.