Six thousand years ago, the Demon God Emperor Feng Xiu descended from the heavens with seventy-two Demon God Pillars. All living beings that came into contact with the aura emitted by these pillars would immediately mutate into demon race creatures, plunging humanity into a dark era. Subsequently, powerful humans organized the Six Great Sanctuaries to halt the advance of the demon race, gradually forming a situation of coexistence between humans and demons. The protagonist, Long Haochen, joins one of the Six Great Sanctuaries, the Knight Sanctuary, as a knight to save his mother. Throughout his journey of growth and adventure, he encounters extraordinary experiences, plots, and fated love and friendship. Long Haochen upholds the knight's spirit, earning the recognition of others through his character and effort. He first forms the 'No. 1 Demon Hunters Team' with other talented youths from the Six Great Sanctuaries to combat the demons, fighting for the survival and dignity of humanity. He spares no effort, even sacrificing his life to protect his companions and the most precious person he loves. However, the world's situation is unpredictable, and more conspiracies brew, along with deeper secrets waiting for him to uncover.