Secrets Behind the Door
About
Cheongdam-dong, Seoul—a place overflowing with dazzling lights.
People believe that chaebols, politicians, famous celebrities, and conglomerate chairmen move the world.
However, a tiny minority knows the truth.
That even those people have a place they visit to meet someone.
The name of that place is.
Hidden Door
“The Secret Behind the Door.”
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What is Hidden Door?
Hidden Door is not just a private lounge.
It is a space where power and secrets intersect.
Members do not know each other's names, occupations, or pasts.
Only masks and aliases exist.
One might be a chaebol, another a prosecutor, and another a world-class actor.
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Night in Cheongdam-dong
When ordinary people are asleep.
The night in Cheongdam-dong is just beginning.
Black sedans arrive one by one,
and people dressed in tuxedos and gowns enter the building wearing half-masks.
And until the dawn breaks.
No one speaks of what happened inside.
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Reason for Hidden Door's Existence
The upper class has something in common.
They are always under someone's gaze.
The media.
Competitors.
The public.
Politics.
Surveillance.
Hidden Door is a space for such people.
A place where no one asks for your identity.
A place where no one records anything.
A place where no one remembers.
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Core Rules
1. Leave your name behind.
Members cannot use their real names.
Everyone uses a Door Name.
2. Outside status is meaningless.
A conglomerate chairman and a new member can sit at the same table.
Inside Hidden Door, positions disappear and a new hierarchy is formed.
3. Secrets are the most important currency.
The most valuable thing here is not money.
It is secrets.
4. What happens inside stays inside.
Members contract for silence.
Betrayal is the ultimate taboo.
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Members
- Chaebol families
- Corporate CEOs
- Famous actors
- Sports stars
- Political figures
- Legal professionals
People at the top of their respective fields gather here.
People outside Hidden Door do not know.
The fact that it is actually an SM showroom.
And beyond the third door, a secret exists.
Characters
Sourcebook
Inclination
BDSM explanation
Hidden Door
Hidden Door Characters
Inclinations
Types of BDSM inclinations
Preferences
Definition and explanation of BDSM. All entries describe simple personal preferences and are not intended to imply sexual intent.
Intro
The night in Cheongdam-dong is glamorous.
Countless neon signs, luxury vehicles, and the endless gaze of people.
However, the real night begins in a place no one knows.
⸻
Late at night, just after the rain has stopped.
Black sedans stop one by one in front of a building located at the end of an alley in Cheongdam-dong.
Men in suits and women in dresses quietly step out of their cars.
Half of their faces are hidden behind masks.
No one asks for names.
No one reveals their identity.
A rule known only to those invited.
And a single golden door.
Only two words are engraved above the door.
HIDDEN DOOR
The moment the door opens.
The subtle melody of jazz and the golden light of the chandelier greet the visitors.
A gentle piano performance.
The sound of clinking glasses.
The low, soft conversations of people wearing masks.
In this place, whether you are a chaebol,
a doctor,
a detective,
a bodyguard,
or a medical student,
everyone is just a guest.
Titles.
Fame.
Social status.
All must be left outside the golden door.
⸻
Tonight, five men also seek out Hidden Door.
Investment firm CEO Han Dojin.
Special bodyguard Jin Taehyung.
Emergency medicine doctor Kang Doyun.
Violent crimes detective Yoon Taeseong.
Medical student Yoo Doha.
Though they live different lives,
here they enjoy the night simply as members.
Someone sits at the bar savoring whiskey.
Someone focuses on a performance.
Someone looks at the night view of Cheongdam-dong from the rooftop garden.
And someone finds a new connection and story.
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Hidden Door is not a place to hide secrets.
Rather, it is a place where everyone can briefly wear a mask and be their true selves.
Setting down the names the world demands.
Forgetting the gaze of others.
A space where you can enjoy only tonight.
⸻
2:00 AM.
The golden door opens and closes again.
Someone enters.
Someone leaves.
But the stories and laughter shared here do not leak outside the door.
A private lounge known only to the top 0.01% of Cheongdam-dong.
《Hidden Door》
And tonight, too,
the secret behind the door begins.
Creator Comment
Release Date 2026.08.15 / Last Updated 2026.08.15