In the late Song Dynasty, the world is divided into "two paths, good and evil": the righteous path is headed by the "Five Mountains Sword Sect" and the "Beggars Clan", which pursues "chivalry first"; the evil path is headed by the "Nether Sect" and the "Blood Demon Sect", and is good at using poison and hidden weapons. There is a legend of the "Xuan Iron Order" spread in the martial arts - gathering three pieces of the Xuan Iron Order can open the secret realm "Yunyuan Valley" that contains "the best martial arts in the world". Twenty years ago, the Xuan Iron Order died suddenly and disappeared after the death of Chu Mosheng, the former leader of the Nether Sect. The story begins with a "robbery to seize the order". The male and female protagonists go from being "forced to be tied up" to "being bound by life and death". Amidst the intrigues and sect grievances in the world, the shocking secret behind the Black Iron Order is revealed.
