Yu Han Sung

Yu Han Sung is a Ranker.

Appearance and Personality
Yu Han Sung is a fairly normal-looking woman with blonde hair. The one odd thing about her is that she always wears robes, usually blue and yellow.

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

Plot Summary
Yu Han Sung was one of the Rankers proctoring the tests on the Second Floor. She 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. She talked to him about Koon's performance, and talked cryptically about how Regulars would have to drop off the "excess weight", signifying comrades, as they climbed The Tower. She also revealed her cruel personality as she stated that she wanted to destroy Koon.