Yu Han Sung

Yu Han Sung is a Ranker.

Appearance and Personality
Yu Han Sung is a fairly normal-looking man with blonde hair. The one odd thing about him is that he looks like a woman. He always wears robes, usually blue and yellow.

He is quite intellingent and perceptive. He is also addicted to coffee.

Plot Summary
Yu Han Sung was one of the Rankers proctoring the tests on the Second Floor. He directly organized the Door Test, in which the Regulars had to rely on a few scant clues to select the "correct" door out of twelve identical doors. The real answer to the test was in fact to open any door before five minutes were up.

Later, Yu observed the hide-and-seek test with Leo-Ro. He is in charge of grading the overall team scoring. He talked to Lero-ro about Koon's performance, and talked cryptically about how Regulars would have to drop off "excess weight", signifying comrades, as they climbed higher and higher up The Tower. He also revealed his cruel personality as he stated that he wanted to destroy Koon due to Koon's multi-faceted personality.