Lin Yi's grandfather, Lin Jiu, rebels in the underworld, and through a secret technique, he contacts Lin Yi in the yin and yang worlds to burn rockets, cannons, and other materials for him. Lin Yi doesn't believe in it, but he still does it, and is ridiculed by the owner of the papier-mâché store. At the same time, Lin Yi is betrayed by his longtime girlfriend, Xu Xiaoxiao, who is killed by Qiao Shaokun, but fortunately Lin Jiu comes from the yin and yang worlds to resurrect Lin Yi. The Yin-Yang Sect convenes a Yin-Yang Conference to prepare for the trial of Lin Yi. The Underworld Monarch orders the Yin-Yang Sect to target Lin Yi, but Lin Jiu unexpectedly has a means to deal with it, and in the Treasure Testimony Conference, he comes up with a restraining magic weapon against the Yin-Yang Sect's treasure, and the Yin-Yang Ancestor is defeated and flees in a haste.