Set in the late Yuan Dynasty, the story revolves around a pair of priceless and extremely powerful weapons, known as the Heaven Reliant Sword and Dragon Slaying Sabre, which many martial artists in the jianghu covet. Either or both of them are thought to allow their wielder to rule the wulin, according to a widely circulating rumour in a repeated mantra. The series follow protagonist Cheung Mo Gai throughout his adventures, and along the way finds him entangled in a complex web of love relationships with four maidens.