Lin Yuan worked as a son-in-law for three years and was looked down upon by his wife's family. He was eventually framed and expelled from the family. While living on the street, he accidentally got an ancient scroll full of incantations at a junk stall. The scroll was actually engraved with the inheritance of demon hunters from the "Era of Demon Hunting" and the secret method of awakening the Haechi bloodline. Practicing according to the scroll, Lin Yuan ignited his bloodline in the ruins of the ancient formation, and transformed into the body of a Haechi who can distinguish between loyal and traitorous people and control thousands of formations. He is sinister and forbearing, and uses formations to lay out the city, trapping the families who bullied him in the past. At the same time, he uses the power of Haechi to subdue loyal forces and attract many confidants with supernatural powers. From the abandoned son-in-law to the master behind the scenes of the city, he gradually uncovered the truth about the wizarding world war sealed in the scroll, and finally took charge of the ancient formations and re-established the order of the world. Behind this is Haechi's great wish to protect all living beings.
