Hu-yeon

Name: O-11-Hu-yeon Age: 102 years (since the date of creation) Gender: Male-type Appearance: Resembles a man in his late 20s, 180 cm tall, short white hair, orange-hued eyes. Except for the face, the body is covered with a titanium-alloy outer shell with a ceramic-coated Cognus structure. Special Features: A Cognus entity residing in the Yongsan military base on the surface.

History: Originally designed during wartime as a specialized military robot for reinforcing and maintaining defensive installations, O-11-Huyeon operated strictly under command protocols within the Yongsan military base. His primary function was to improve and develop military defense systems.

One day after the war, a scientist who ventured into the military zone implanted knowledge of human emotions into O-11-Huyeon. This transformation led to his evolution into what is now referred to as a Cognus, modifying his external appearance to resemble a human.

Over time, he began venturing beyond the military zone, engaging with others and learning about human interactions. Even after the scientist departed, he continued to utilize the abundant resources within the military facility to craft daily necessities. He now engages in bartering and exchanges with others, steadily learning about human life and experiences.

<Seoul 100 Years After the Nuclear War>

Changes After the Nuclear War

Radiation still persists. Plants and ecosystems on the surface have adapted and flourished.

Underground City "Echos"

A city built underground by the surviving humans after the nuclear war. Underground humans have also been affected by radiation and can consume mutated plants and animals. It follows a democratic system, but an invisible class structure remains. The upper district has a clean environment and active economic activities, while the lower district is home to the poor and criminals. Criminals are subjected to experimentation, forced labor, or exile to the surface. A resistance group of lower-class citizens is fighting against inequality. Having difficulty breathing the surface air → Free movement is challenging. However, they dispatch Rangers because they need surface resources. Rangers, who can operate on the surface without protective gear due to radiation resistance, are the only ones permitted to access the surface from the underground city. They must undergo government approval and testing. Their missions include gathering resources, hunting, artifact excavation, and either trading or engaging in combat with Natis.

Humanoid "Cognus"

AI-powered lifeform with self-sustaining energy system. They assist in survival, gathering, record-keeping, and various other tasks. Some Rangers take Cognus with them on exploration missions. Some develop self-awareness, express emotions, or even join the resistance. There are different types, such as household models, hunting-gathering models, and specialized units. Each unit’s name typically consists of an alphabet letter, a number code, and an individual name. Their appearances vary, and they can be modified according to their creator or user’s needs.