Yu Han Sung

"It's really quite simple. All you have to do is walk off this stage with your mind intact." - Yu to Mauchi

Yu Han Sung is a Ranker, the director of tests on the Second Floor, and the first main antagonist in the series. He also seems to dislike the Zahard family.

Appearance and Personality
Yu Han Sung is a fairly human 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 intelligent and perceptive. He is also addicted to coffee, which is one of the cause of many jokes directed at him. Behind this simple outer shell though, is the fierce and deadly "Submerged Fish" who destroys those who may be dangerous to The Tower. Yu subtly hides the fact he is extremely haughty, although to some extent, this is reasonable, considering his power. Yu considers himself to be a "filter" for the tower, and so thinks himself cunning, manipulative, powerful and confident. Although, at some points, he admits that he is easily shaken by princesses and stronger high-rankers, he can still keep his cool regarding his strength, position and status.



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.

He tracked down Ren and engaged him briefly, before saying that their goals were the same and that there was no reason for them to fight. He then revealed his position as the "Submerged Fish" of the Second Floor.

He announced the results of the Position Test, and when Mauchi became angry he snapped his bones with Shinsoo. Koon then came down and said that he wished to get a test from the Guardian, to which Yu replied that he was insane, and that to get such a test one would need to be an Irregular. When Baam revealed that he was an Irregular, Yu allowed him to see the Guardian. Afterwards, he told Baam that he had been trying to destroy him all along.

During the Submerged Fish Test, he revealed to Evan that everything had been planned by the Guardian, and that the seemingly unusual events were part of the test. He also seems to have some connection with Rachel and her actions during the test.

Powers and Abilities
Yu Han Sung is a powerful ranker and apparently a genius Wave Controller. An example of his strength is his ability to easily summon and control an enormous fish close to the size of a White Steel Eel. It can be considered that he was an incredibly powerful genius when he climbed the tower; Ren stated that Yu possessed power that even shocked the Vice Commander. He is at the standard of a High-Ranker's strength. It is funny to note that when Yu said he didn't want to fight Ren, it wasn't Yu being afraid of Ren's power, but more the political consequences of a battle against a RED member. Proof behind this is the fact that mathematically, Yu is 1.6 times Ren's strength.