1937, Gyeongseong, Joseon.
There existed a heretical figure known as the 'Shamaness in Black', whose existence was concealed by the Government-General of Joseon.
A penny dreadful horror novelist from Japan, Iwaya Kyousui, pushes his way into accompanying her in order to conduct research for a novel he's writing.
A tactless novelist and a heretical shamaness form an unlikely partnership, unfolding a Korean occult action story.
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