Yu Han Sung/Appearance and Personality

Appearance
Yu Han Sung is portrayed as a man with long blonde hair, with yellow eyes and quite feminine or, rather, androgynous features. He always wears a hanbok, usually blue and yellow. He usually keeps his hair in a high bun, with a traditional red hairpin sticking through the bun, which has the design of a butterfly on the end.

Personality
Yu Han Sung has been seen as an extremely intelligent and perceptive individual. He is addicted to instant food, which is the cause of many jokes directed at him. Behind this simple outer shell, lies the deadly "" who destroys those who may pose a threat to the Tower. Also, he probably recognised and admired Koon Aguero Agnis' talents but relished the thought of crushing him as he likely couldn't tolerate the existence of another "genius", due to his own pride and ego.

Despite his abilities that could easily grant him a better job on higher Floors of the Tower, Yu Han Sung remains as the 2nd Floor Test Director to fulfill FUG's goals. He claims that one must "weed out those who will bring harm to The Tower". However, he is recognised for his strength which Lo Po Bia Ren stated "impressed even the Vice Commander".

Yu Han Sung has been described as a chairman by SIU. As in: he makes people "fight each other for his advantage".