Great Li Dynasty in chaos as Four Fiends wreak havoc. Kunlun Disciple Milo descends to the mortal world, meeting bounty hunter Jessa and corpse handler Old Smoker Gus. The trio survives the Taotie disaster in Blackwater City. Milo uses Four Symbols Formation to reseal Taotie, transforming his wooden sword into the Heartseeker Sword. The National Demon Hunt Tournament begins, leading to a demon-hunting journey to the Southern Borderlands and Northern Wastes.