For generations, the courageous warriors of the Northern Heavenly Sect valiantly safeguarded the realm from the malevolent Silent Night. However, when the fourth-generation leader faces accusations of treachery, he disbands the sect and sacrifices himself to shield his son, Moo-Won. Bereft of kin and comrades, Moo-Won endures a watchful existence until a daring assault by the Silent Night offers him a chance to flee to the mountains. There, the youthful fighter hones his skills in the ancient arts passed down by his predecessors until a mysterious vanishing of a beloved compels him to return to civilization. Join Moo-Won on his quest for retribution for his father's demise and his mission to vanquish the sinister forces that threaten to cast the world into shadow!