Hidden Floor

The Hidden Floor (숨겨진 층, Sumgyeojin Cheung) is a fake, imaginary data world located inside the Hell Train. Only the Regulars who have cleared the entire Hell Express can leave their data in the Hidden Floor. People who have clear the train and entered the hidden floor will be called as "Warriors" and will be guided by wandering minstrel and record their adventures.

About
To gain an access to the Hidden Floor, Regulars must cleared the entire Hell Express. All regulars who succeed to do so, will be given a privilege to record or save their data, (this "data" means about all regulars' personal details such like name, appearances, personalities, abilities, life history and biographies, etc) in the train's system. This "data" will remain in the system and create some kind of Artificial Intelligence (A.I) life which all come together to form The Virtual Floor. These Virtual Floor "does not exist in reality" within the tower.

Although the concept of the hidden floor is a fake, imaginary world, you still enter normally with your "real body" as a "living being". In other words, you will still experience real injuries, real pain, bleeding, and the worst case scenario, you can "die".

Rules
There are several rules on the hidden floor.
 * 1. Anyone who reveals the details about the existence of this floor to the outside will lose both their data and their memory about hidden floor.
 * 2. Once you can become a ranker, only your data remains and you cannot enter the floor again. In other words, ranker or high rankers cannot enter the hidden floor.
 * 3. Once you have cleared the train, you cannot update your data or bring any items or goods obtained in that place outside the floor.

Exceptional Rules and Condition
There are several special cases where the rules are broken:
 * As one of the Family Leaders. Po Bidau Gustang was exempted from some of the rules, but his status as high ranker still forbids him to enter the hidden floor.
 * Zahard (broke rules No.2), despite his status as high ranker, by transferring part of his present self-data to enter the hidden floor through two special mirrors device (one mirror was sent to Baam and another one was used to confront Yellow, Ha Yura, Icarus, White and Data Urek.
 * Ja Wangnan (broke rules No.3) by bringing a mysterious weapon like dagger to the outside. The weapon can talk and has a self-awareness.
 * Treasure Eating Stingray (broke rules No.3) by bringing Zahard's special bracelet to the outside. The bracelet seems to be a real items from the outside that was stored inside the hidden floor by Zahard.
 * If regulars haven't finished clearing the Hell Train, you can still enter the hidden floor by using the special item Master Key. People who used this method cannot save their data in the hidden floor.

Entering The Hidden Floor
There are two ways to enter the hidden floor.


 * Main Door: Entering the hidden floor through the main door means that you enter in an unusual way because normally, you will enter the hidden floor in a way of "saving you data" after clearing all the hell train test. But, entering through the main door means you don't have to clear all hell train test. However, you also can't save your data. These "main door" cannot be destroyed even by a ranker like Karaka. This door is heavily locked and can only be opened by using the Master Key. To be able to gain access to enter the "main door" of the hidden floor that was hidden inside the hell train, you should obtain just one of the two master key. One key is currently in the possession of King Zahard and the other key is in the hand of Hell Train conductor (Currently, the Master Key of Hell Train conductor was stolen by Gustang and given to Baam).


 * Normal Way: There is a normal way to enter the hidden floor. It is said, you will be able to enter the hidden floor after clearing all the hell train test. However, this method wasn't explained clearly in the chapter.

After you embark on journey inside the hidden floor as a real human and completing quest missions, it seems that the 'system' will use computer projection to create a fake body and image of yourself and it will 'artificially' live inside the hidden floor forever.

History
After going through Revolution on the Hell Train, Zahard sensed that he will become a godlike being, so he sought to preserve his "human" self. When one of the disciples of The Workshop found out about this concern of Zahard, he gave Zahard the Mirror of the Past as a gift. That mirror has the ability to store a person's present self within it. Upon hearing this, Zahard was so happy and immediately 'store' himself in the mirror.

After Zahard stored his image using the Mirror of the Past, several of his companions did the same. The Future King of the Tower left the Mirror in the last room on the Hell Train, so that only those who clear the Train may see the world within the Mirror.

When Zahard became the King, his fame soared and many Regulars left their data in the Mirror to meet younger version of the King in this artificial world. The disciple of the Workshop found out that the data were living inside the mirror, creating their own world. The disciple decided to protect that world and the Spell of Oblivion was placed on the room with the Mirror of the Past. Whenever someone who stored himself in the Mirror trys to reveal anything about that place, they forget everything about it. The Disciple also created a single door to that new world, along with only two keys. He gave one key to Zahard and another to the conductor of the Hell Train. After hearing what had become of the Mirror of the Past, Zahard was amused and is said to have called it the "Hidden Floor".

The Hidden Hidden Floor
The Hidden Hidden Floor (숨겨진 숨겨진 층, Sumgyeojin Sumgyeojin Cheung) is another data virtual world aside from the Hidden Floor. Hidden Floor was first intended as a virtual world within a mirror, created by Zahard in order to preserve the young version of himself from when he cleared the hell train. After that young Zahard and his companions became data and created a world of their own. But following that, data Zahard and his companions grew tired of the huge increase in the numbers of newcomers data humans in the hidden floor. They wanted to separate themselves from them.

With the help of someone from the outside who brings another mirror and had the two mirrors face each other, the Hidden Hidden Floor was created. After that data Zahard transfered to hidden hidden floor with only a few chosen people.

Stage 1: Town of the Wandering Minstrel
Town of the Wandering Minstrel is a place that will welcome all the warriors who have cleared the hell train. All warriors who entered in normal way to the hidden floor will be summoned here. This village was lead by the village head Rose.

Stage 2: Cold Land
TBA

Hidden Stage 2: Sweet Castle
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Stage 3: Rough Land
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Hidden Stage ?: The Palace of Spears
This place is the main residence of Data Eduan inside the hidden floor. Not every Khun Family regulars data can visit this place. Only Eduan's favorite child can visit the Palace of Spears, they are Data Maschenny, Data Asensio, and Data Icardi.

Stage 7: Labyrinth of the Minotaur
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Stage ?: Town the Golden Dome
Town the Golden Dome is a place within the hidden floor. This is a town full of artificial robots. The structure of this town was so unique that it has only one pillar beneath it as a foundation to make it stand. There is a golden dome right in the middle of the town, it is not known for what this building was built for, nor about it's use, purpose, and benefits. To access this place, the hidden floor adventurers have to aboard several wooden floating boats, as the media of transportation to across. The boat was so similiar to gondola or canoe boat. The boat was navigated by the many eyed race, "Da-an Tribe".

They arrive at the town called the Golden Dome, where Rachel notices the presence of someone. She quickly precedes to excuse herself to look for this person that she thinks might be Ha Yura. The rest decide to split up to look for the rest of their companions. Baam ends up alone inside the dome, where an Data Zahard confronts him. Rak Wraithraiser notices that something is wrong a rushes towards Baam. Baam does not know who is infront of him until he introduces himself as Zahard.

Stage 21: Seed
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Extra Stage: Training Stage
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Hidden Stage: Glitch Room
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Location

 * Quarantine Area
 * Treatment Plant for 'Quarantined Elements'
 * Spiral Staircase
 * The Beach where Khun and Hockney landed

Good Deed Points
Good Deed Points are points that will be received by 'the warriors' after they can defeat a 'villain' and complete the quest. If you can gather enough good deed points, you will filled the Good and Evil Monitor with white bars indicator or white light. The "Big Breeders" will give you the scroll for the "main quest" where you banish that Fruit of Good and Evil to hell.

Fruit of Good and Evil

 * Special Door: There is one and the only way to "escape" from the quarantine area, that is through a special door. This special door was found by Data Yu Han Sung in all his life and journey as a Data Humans in the hidden floor after experiencing many adventures and deaths with Batis and other 'quarantined data human'. When Hansung first found the door, he and other quarantined data humans tried to opened it, but the door cannot be opened at all. Hansung also tried to destroy the door with his shinsoo attacks, but the door remains intact. It was revealed later by big breeder Chung that the special door has been set up so that no ordinary person can open or destroy it. According to Chung, the only way to open the door, is to use a special, exclusive technique that only Zahard and his companions used. Chung himself didn't know about the special technique, he just know that it belongs to 'Zahard and his friends'. That technique was later confirmed to be "Shinwonryu", after Baam can open that special door by using Shinwonryu, a special technique that only exclusive for Irregulars after they received 'Revolution' by the "God" of guardians, so this explains why Yu Han Sung and other quarantined data humans can't open or destroy the door.

Villains
Villains are quest monsters which has to be defeated by The Warriors" on their journey and adventures in the hidden floor. These villains has alphabet levels or grades (A|B|C|D|E) from weakest to the strongest.

Villains are summoned through the Villains Scroll. When the quest begin, a villain monster will appear in a certain spot. And if you defeat that 'villain', you complete the quest and receive "Good Deed Points". Here's the following list of the villains:
 * Armored Armadillo
 * Giant Cyclops Monster
 * Robot Chroma (B-Rank)
 * Giant Octopus
 * Many Giant Rats
 * Mother Long-Tailed Tit (D-Rank)
 * Screaming Plant (E-Rank)

Champion Villains
Champion Villains are villains who act as the boss monster of the final quest.

Villains Scroll
Quest Scroll is a scroll that store all data of the villains in the hidden floor. This scroll was used to summon monsters for the warriors to defeat. To access a scroll and summon the villains, you have to scan the scroll "barcode" by using Good and Evil Monitor which functioned as the "barcode scanner". When you scan the scroll barcode and push the button on the right side of the Good and Evil Monitor, the quest will begin immediately.

Bug Room
Sometime during his climb of the Tower, Urek Mazino visited the Hidden Floor. He promised the Big Breeder that he will not cause trouble, but when he is later informed that his data self will be unstable due to trouble in saving his data, Urek smashed the mirror in anger. This caused bugs, such as the continued existence of Urek's sworn enemy, which was supposed to disappear after Urek left. The sworn enemy is also weakened, compared to Urek. The bug also caused changes in the Hidden Floor, causing the artificial data humans to become more human-like than they should be.

One of the Big Breeders isolated these bugs into a room, dubbing it the Bug Room.

Data Human

 * Batis
 * Medley
 * Mi-eum
 * Rose
 * Dee

Data Regular

 * Khun Eduan
 * Khun Icardi
 * Khun Marco Asensio (Data)
 * Khun Maschenny Zahard (Data)
 * Yu Han Sung (Data)
 * Zahard (Data)

Shinheuh

 * Goliath: A green giant turtoise that can standing and walking with his two foot.
 * Giant Snake Divine Sea Fish

Others

 * Big Breeder
 * Sworn Enemy
 * Hidden Floor Soldier

Notes and Trivia

 * The Hidden Floor is ruled by Big Breeders. They are comparable to Guardians.
 * The Hidden Floor is inhabited by data of Regulars and artificial data humans.
 * Every Regular has a Sworn Enemy generated, based on their past.
 * Regardless, the Floor of Death and the Hidden Floor is like a 2 for 1 set of arcs. They are leading into the thick of the plot perhaps as well. And in this arc we will get to see more of the characters that didn't get spotlighted in the Floor of Death.
 * SIU has stated that this arc is based on a popular trope of "living inside a video game" found in many light novel and manhwa that swept across Korea and also recently across Japan. However, he is focusing less on game-like aspects but more on the virtual reality. So the characters from this arc are less game characters but more of a virtual organism, a human composed of data, that's the idea at least. So he's skipping the usually used concepts such as items, skills, status effects and the like for this arc for added realism.
 * This arc is based on RPG games "Hero Legend Series" or "Ustonicia Story".
 * Although SIU has said this arc is loosly based on the "video game is reality" genre, the plot and theme will be much more Cyberpunk in nature. In addition, there will be a few stories about some characters pasts or the Ten Families or the Tower itself.
 * SIU also think about the Sworn Enemy system, while serving a narrative role of "balancing this world", can also tell a great number of stories.
 * Since the Hidden Floor arc has similar themes with the Floor of Death, a lot of the lore and the central themes will be similar.