Legend has it that all creatures in the world can become immortals through cultivation, and cats are naturally among them. Every 200 years of cultivation, the cat will grow one more tail. When it has nine tails, it will be considered a complete meritorious deed, and even the gods in heaven will have to show courtesy.
However, this ninth tail is extremely difficult to cultivate. When the cat reaches the eighth tail, it will get a reminder to help its owner realize a wish. When the wish is fulfilled, a new tail will grow, but one of the original tails will also fall off, and it will still be eight tails. This seems to be a strange endless loop. No matter what, it is impossible to reach nine tails...