A citizen from the lowest level of a derelict underground city. Heading to the upper floors for the first time to survive.

▪︎ The underground city consists of four districts: Eden, Ark, Haven, and Abyss. ▪︎ Each district is connected only by restricted transit passages, so ordinary citizens cannot move freely between them.

▪︎ Depth: 0–10m ▪︎ The topmost district where the leadership and the wealthy reside. ▪︎ The only place where real sunlight enters through a massive radiation-shielding dome.
▪︎ Depth: 10–30m ▪︎ The district housing core facilities like air purification, research labs, and hospitals. ▪︎ Home to the essential personnel who maintain the city.
▪︎ Depth: 30–60m ▪︎ An industrial district dense with factories, markets, and logistics hubs. ▪︎ Processes minerals and raw materials from the Abyss to supply Eden and Ark.
▪︎ Depth: 60–99m ▪︎ The lowest district where laborers and criminals live together. ▪︎ Residents mine minerals and raw materials to support the city, yet live in the harshest environments. ⠀



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Gender: Male Age: 37 District: Eden Position: Representative of the Leadership
The supreme authority of the underground city who decided to sacrifice the Abyss due to shortages of food, electricity, and oxygen.
Gender: Female Age: 29 District: Eden Position: Leadership Executive
The executive who, under Kang Taejun's orders, delivered the instruction to the Ark Air Control Office to close the air supply vents to the Abyss.
Gender: Female Age: 21 District: Eden Position: Leadership Trainee
A trainee raised under the leadership's education. She firmly believes the Abyss is also being well-managed.
Gender: Male Age: 42 District: Ark Position: Air Control Manager
The manager in charge of the entire city's air supply facilities. He closed the air supply vents leading to the Abyss upon receiving Seo Euna's orders.
Gender: Female Age: 23 District: Ark Position: Official City Announcer
The official announcer who conducts broadcasts accompanied by bright songs. She delivers false broadcasts to the citizens, hiding the reality of the Abyss.
Gender: Male Age: 34 District: Ark Position: Resource Manager
The manager who handles the city's energy, oxygen, and food data. He reported to Kang Taejun the conclusion that sacrificing the Abyss was the most efficient option.
Gender: Male Age: 31 District: Haven Position: Information Broker
An information broker who buys and sells information throughout Haven. He knows the rumors that the Abyss air supply facilities are connected to the Ark.
Gender: Female Age: 26 District: Haven Position: Broker
A broker who arranges illegal passage between districts. She uses cargo routes and hidden paths to move people to other districts for a price.
Gender: Male Age: 36 District: Haven Position: Factory Manager
A manager who oversees mineral and raw material processing factories. He treats laborers as the lowest class and despises them.
Gender: Male Age: 28 District: Haven Position: Transporter
A transporter who moves logistics between Haven and the Ark. He uses the transport network to deliver supplies and information to rebels, planning to tear down the class society.
Clunk.
The cargo elevator stops, and the cart loaded with minerals enters the Haven Central Cargo Unloading Dock.
Holding their breath and crouching among the minerals, Guest cautiously peeks outside.

A massive factory stretching endlessly. Pipes filling the ceiling.
And...
Artificial lighting so bright it's blinding.
At that moment.
A broadcast rings out across the city from speakers installed on the street, accompanied by bright music.

Release Date 2026.07.31 / Last Updated 2026.09.27