In the alleyway on a rainy night, the life lamp flickers. Her name is "Mu", and she is a life lamp master who can repair other people's life lamps but consumes her own lifespan; he, whose name is "Mu", is a black-clothed swordsman who bears the family curse and guards the rift in the abyss. In an accident, she caught a glimpse of his lamp shadow locked by an ancient oath. From then on, the fate of the two of them was closely connected by a lamp and a "sheep stone".
From Yuan City to Guixu, from the tactics of Ming Deng Si to the giant beasts under the abyss, they chose each other again and again amidst wind, rain and betrayal. When the "Lords of the Abyss" want to use all living beings as their salary to restart the Abyss, they must use the lamp as the key and the heart as the blade to rewrite fate and redefine the meaning of "guarding".
