There is a special organization in the Tang Dynasty - the Bad People. They are yamen runners, but they are all people who have committed serious crimes. A case in which a dwarf puppeteer manipulated poisonous insects to kill people led the Bad Leader Pei Xin and others into a difficult situation. Pei Xin, who was trying to unravel the mystery, did not know that what was waiting for them ahead would be a more terrifying conspiracy by the Netherworld Poison King...