Gu cultivators refine Gu worms and plant them inside other cultivators. The worms devour their spiritual qi and influence their minds, so the cultivation world considers the practice demonic and unorthodox. Chen En was the Gu Sect's senior disciple, specializing in refining Desire Gu. Thanks to his outstanding talent and abilities, his master sent him to Qingyun Sect, the world's foremost orthodox sect, to serve as a spy. Then one day, Qingyun Sect's Saintess was injured by Chen En's junior sister from the Gu Sect and infected with Desire Gu. Her face flushed, sweat soaking her clothes. Chen En knew his chance had come. He helped the Saintess rid herself of the Desire Gu, and from then on, he rose steadily through Qingyun Sect, becoming a celebrated figure in both the orthodox and demonic paths.
