In 2029, after the governments of North and South Korea announce a 5-year plan to reunify the country, strong sanctions by the world's powerful nations cripple the economy and lead to a hellish period of chaos. With the appearance of an armed anti-government terrorist group called The Sect which opposes reunification, the President creates a new police division called the Special Unit which amasses significant political power. However, the intelligence service Public Security, which sees its own influence drop, hatches a plot to annihilate the Special Unit. Amidst this bloody struggle between two ultra-powerful institutions, rumors emerge of a secret "Wolf Brigade" being formed within the Special Unit. The human weapons who are called wolves, "Illang" (The Wolf Brigade).