FUG

"Why are you so shocked? Did you really think that we were nice people?"

- Hwa Ryun explaining to Ja Wangnan what they did to Baam FUG (퍼그/FUG, Peogeu), lead by Grace Mirchea Luslec, is the most dangerous and secretive criminal syndicate in the Tower. Their official members wear the "Mark of the Slayer".

Although FUG’s true motives are not clearly known, it is true without a doubt that they exist in the shadows of the Tower, hoping to accomplish their objectives.

Slayers
"In FUG, there are those who have a grudge against 10 Families and Zahard, those who envy what they possess and those who want to change the Tower. A Slayer is a GOD who fulfills their wishes."

- Vol.2 Chapter 36 Within their infrastructure, FUG has 11 Slayers (슬레이어, Seulaeiyeo). The origin of the name is very simple: "One who kills" Zahard and the 10 Families; most Slayers target one of these 11 figures.

There are presently 7 active Slayers out of 11 seats (although according to Baam, they are mostly sleeping): All are supposedly very powerful. Slayers are treated as walking Gods by FUG members. SIU noted that the latter blindly follow the former, regardless of whether their wishes are good or evil.
 * 5 have unknown whereabouts.
 * 2 are acclaimed as "devils".
 * The remaining 4 positions are vacant.

The Slayers of FUG are divided into three types, depending on their time of appearance:
 * 1) Firstly, there are those like Luslec who emerged in the age of the 10 Great Families - they are known as the ancient gods.
 * 2) Secondly, there are those who once again burned their names into the memories of the Tower's residents when FUG had become a power completely submerged in darkness - they are the demons of the 2nd generation.
 * 3) Thirdly, there is the current generation of Slayers who are active in the present.

"Slayers are treated as walking Gods by FUG members."

- From SIU's blog

Organisation
FUG is an organisation shrouded in shadow. They have no visible physical forms or headquarters, but the higher ups are of the High Ranker level and most likely possess control over part if not all of some Floors: for example the Bayroad fighting pit and Karaka's hideout on the 97th Floor. As those are hidden places in the Tower, we can assume that the other places of gathering or control of the group are just as secretive.

FUG is often compared to the Wolhaiksong because of their opposition to the 10 Families. However, whereas Wolhaiksong is more of a "social club" centered around several members, FUG is a "religious organisation" centered around a single faith: to kill Zahard and the heads of the 10 Great Families. Although the relationship between the two organisations is not that good, there are a few members who are associated with both groups.

The 10 Families forbid anyone within their Families to enter FUG and they consider it an important duty to eliminate their members, who are known to hide within the shadows of the Middle Area. Despite its dangerous status, it does not mean that they hold enough influence to challenge Zahard and the 10 Families. As long as the 10 Family Heads hold the contracts with the Tower’s Guardians, FUG’s influence cannot overcome the Family Heads regardless of how strong the organisation gets. In particular, Zahard holds such a contract that prevents the inhabitants of the Tower from killing him. In order to overcome this matter, the organisation waited a long time for someone free from the Guardian’s contracts: an Irregular (such as Jyu Viole Grace), unbound by the contract and thus suitable to fulfil their wish.

Structure
The structure of FUG is slowly appearing as the story goes. At the top are the Slayers who are considered living gods. The number one Slayer is Grace Mirchea Luslec, also called "God of the Devils". Then there are the Elders, who take decisions with the active Slayers on the great plans of the group, for example, appointing specific personnel for delicate missions; according to Evan Edrok, they are more mysterious than the Slayers. Then there are High Rankers who hold specific positions and power within the group (e.g. Ha Jinsung who is a martial arts teacher of the Slayer candidates). Slayers have command over executives (probably at least at the level of a Ranker; for example, Karaka commands over Poken). Executives can have dormant Regular agents planted on different Floors that wait, sometimes for thousands of years, until they are called to accomplish their missions (e.g. Reflejo). Finally the executives can recruit Regulars that are fervent believers in FUG or FUG's causes (e.g. Xia Xia). Though there seems to be a structure and a head to the organisation, that doesn't prevent dissension among the group. As for now, a splinter centred around a few Slayers and Elders has decided and put forth a plan in order to alienate the powers of Jyu Viole Grace and the Thorn.

Slayers

 * Grace Mirchea Luslec: Founder and No. 1 Slayer of FUG.
 * Imort: Slayer.
 * Karaka: Slayer. (targets Zahard)
 * Baylord Yama: No. 7 Slayer of FUG
 * White: No. 10 Slayer of FUG (targets Arie Hon)

Rankers

 * Augusgus: High Ranker, Test Director of the 20th Floor
 * Ha Jinsung: High Ranker, Viole's martial arts teacher. Also taught Karaka.
 * Madoraco: High Ranker; businessman providing financial aid for Gong Bang's research involving Living Ignition Weapons.
 * Pedro : Follower of Karaka and former conductor of the Hell Train.
 * Poken: Executive.
 * Unnamed Ranker: Aided Madoraco in the latter events of the Workshop Battle.
 * Yu Han Sung: High Ranker, Test Director of the 2nd Floor.

Slayer Candidates

 * Hoaqin
 * Jyu Viole Grace

Regulars

 * Angel: Buelsar's companion.
 * Buelsar Elliot: Mad Dog of Yama.
 * Hwa Ryun: Guide (Technically, no longer a Regular. )
 * Reflejo : Agent planted by Poken in the E-ranks after he lost everything to a Princess.
 * Ron Mei: Varagarv's companion.
 * Varagarv: Mad Dog of Yama.
 * Yuto: Guide. E-rank Regular appointed by the Elders to deliver the fake Thorn to Viole.


 * Apple: Attempted murder of Koon Aguero Agnis
 * Devil Bon
 * Grobin : Team Mad Dog
 * Michael: Attempted murder of Koon Aguero Agnis
 * Miya
 * Pandit : Team Mad Dog
 * Rachel
 * Ridong : Team Mad Dog
 * Viviolga : Team Mad Dog

Possible Affiliations to FUG
Note: Some characters may be listed here if it's unclear whether they're related to FUG.
 * Beniamino Cassano: A product of the Living Ignition Weapon experiments. He was part of Team FUG during the Workshop Battle but was seemingly only doing so for his own reasons. His current connection with FUG isn't clear. He delivered Emile to Rachel's team and has been part of it ever since.
 * Ha Yura: A Light Bearer and former singer idol who joined Rachel's team.


 * Traveller: A traveller lured by Emile to the Archimedes. He has been travelling with Cassano after the latter showed him the true nature of Emile.
 * Evankhell: A High Ranker and also was the Ruler of the Second Floor.

Notes and Trivia

 * While the proper name of the organisation is unknown, some readers believe it to be "Forgiven Under Grace", titular to its founder, Grace Mirchea Luslec. SIU confirmed that the G in FUG does stand for "Grace" (though perhaps not for Luslec).
 * According to Baam, it is rare for a Regular to be chosen as a Slayer Candidate.
 * Baam thinks he has already seen Karaka's silhouette somewhere. Yet, when they do meet, Baam does not know his name, and Karaka asserts that it is their first encounter.

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