The rules are weird but accidentally brought into the Taotie version: the protagonist Qingliu is a Taotie with special bloodline and can only swallow ghosts or items from the underworld. When he was about to starve to death, he finally waited for his soul to come to the human world accidentally. He was unlucky enough to be chosen by a weird game and became the chosen one. In the novice copy, he met his own kind, Ziwei, and started eating all the way.
