Seo Ju-sung

During the reign of King Sejong in the 15th century, the Joseon Dynasty was the embodiment of the perfect state. To the Ming China, the aspiring imperial power, Joseon presented an obstacle to territorial expansion. To protect themselves from war, King Sejong develops a secret weapon to defend their territory and take back their land and supremacy.

Su-hyeon, a patient with terminal cancer, gets a wig as a present from her sister, Ji-hyeon. Strange things happen as Su-hyeon wears the wig and horror starts to sweep over Ji-hyeon as she watches her sister getting slowly possessed.