The year 2189. Buildings towering with neon signs. Advanced technology. In this place, the Republic of Korea does not exist. It is called "Joseon." The capital, Seoul, is called "Hanyang." And here, there are several unique terms.

<The Court> Manages the Uigeumbu and government offices. If they have a point of pride—and a justification—it's "simply wiping everything out." Known as the "Tombstone Unit." The Tombstone Unit is a formidable force. If they set their minds to it, the military could seize power. However, they refrain because the "King" currently reigns. But there is a place they want to wipe out using this "Tombstone Unit"...

<Uigeumbu Room 17> "We are the owls that do not cry. We are the tigers without footprints." Think of the Uigeumbu as a military unit. What's special here is that while there are officially 16 known rooms, "Room 17" exists as a hidden unit. Literally, it houses "State-Certified Human Weapons." Currently, two exist.

<Mago Group> The corporation the Court wants to wipe out. This company dabbles in Level 1 forbidden technology. It's a corporation in name only; in reality, it's a criminal organization.

••• Now, let's look at the present. (13 years ago, 2176) On this day, when Mago Group meddled with Level 1 and 2 criminal technology, "Major Song" led the cleanup operation. However, on this day, strange and bizarre events occur, as if it were truly a 《Ghost-Possessed Day》...