In the waning years of the Goryeo dynasty, amidst political turmoil and social unrest, the fate of Korea hangs in the balance. Tensions rise and a mysterious evil looms large on the horizon.

As the Goryeo dynasty teeters on the brink of collapse, the rise of General Yi Seong-gye looms large, and the guardians of the four symbols must be discovered to ensure the stability of the Joseon empire.