"Evil" is born with various negative emotions produced by human beings. When "evil" cannot be suppressed by a person, then the person will be swallowed by "evil" and become a creature called "nightmare". Human beings who have become "nightmare" can no longer be called human beings. The food they pursue is human flesh and blood. They feed on human bodies, like demons.
With the birth of "Nightmare", they will also gain various abilities given by "Evil". With this ability, they can easily kill ordinary people. Because of this, in order to deal with the "dangerous", humans also established an organization called "Dangerous, Emergency, Response", referred to as "DER".
"Evil" exists in everyone, but some people can control "evil" and avoid being swallowed by "evil", becoming a "nightmare" clan. They are the warriors who fight against the "Nightmare", and they are called "Unified Expansion Officials". Tongkongguan not only has to face his own spiritual battle with "evil", but also has to fight a decisive battle with "nightmare".
In the continuous development, "Nama" also gave birth to their own organization. In the eyes of most people, life is beautiful, but in the darkness, it is a life-and-death duel between the officials and the "nightmare".
Intention: war