Yun Xiao, the Taoist priest of Qingxuguan, spends his daily life helping the villagers find chickens and grabbing candy cakes with his junior brother Qingfeng, until one incident after another breaks the peace - the bamboo rat spirit that steals bamboo strips, the wolf spirit that disturbs the wheat fields, the evil spirit that robs food for disaster relief... From teasing little demons to confronting the conspiracy of the Blood Demon Sect, he gradually discovers that the piece of Qingxin jade around his neck hides the past of his parents' fight against evil cultivators.
The peach wood sword can cut through the demon atmosphere and protect the common people, but it can cut off the fetters: Master Xuanchen has hidden the past for fifty years, Junior Brother Qingfeng has risked his life to protect him, and there is also the warmth hidden in the smoke of fireworks - Uncle Ma's bamboo strips, Doctor Zhang's medicinal soup, half a piece of dry cake held by the victims...
When the shadow of the Blood Demon Cult shrouded Suoyao Cliff, and when the old case of his parents intertwined with the phantom of Baixi Tower, Yun Xiao finally understood: practice is not only about the shadow of the sword that kills demons, but also about keeping the heat in the heart - the blood and fire when protecting food, the trust when breaking the formation, and the sense of "I am here, you are safe" in the lights of thousands of houses.
This is a story about growing up, with laughter and tears, swordsmanship and tenderness. It tells how two half-year-old boys, with a peach wood sword and a pure heart jade, can find their own way among the monsters and monsters.