The Underground

MINCHAN:

Beneath the city everyone knows, lies a world no one was meant to find.

After years of hunting classified trails and buried government secrets, Chan and his team-Changbin, Jisung, Felix, and Jeongin- are forced through a door that doesn't exist on any map. A door that decides who is worthy to enter... and erases those who aren't.

What waits below isn't a bunker or a project-but an entire underground civilization, glowing with impossible technology, artificial skies, drones, and machines that make the surface world look primitive. Here, intelligence is survival, and power is absolute.

Hidden within this city is Minho, the weaponsmith-raised in a compound where brilliance meant life and failure meant death. He designs weapons so advanced they blur the line between science and destruction. Beside him stands Hyunjin, the wielder, designer of the hoverboards that rule the skies below, and Seungmin, the wiseman whose code and inventions keep the city alive.

Sheltered by a mysterious woman who knows more than she lets on, Chan and his team are given a warning:

If they want even a chance at surviving the government that rules this world beneath their feet...
they need to find the weaponsmith.

But some doors don't open without consequences.
And some worlds don't let outsiders leave unchanged.