Prequel to Ancient Times

Ren Xiaoyao used the secret method of the online master to save his beloved cat. Originally, he was just treating a dead horse as a living horse doctor, but he didn't expect that the door to a new world would open up. The world was no longer the world he knew, and his cat turned out to be a dragon. Demons from outside the realm are attacking the underworld, and the world they live in is in danger. I thought the master was a charlatan, but I didn't expect the master to be his son or daughter. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.