By the way, Taoist question, is the fate of reincarnation of immortals a matter of life and death in the underworld? Who cares about the reincarnation of the extremely high fairy?

Immortals don't reincarnate because they become immortals. In oriental legends, immortals are souls, not bodies. If you die, you die directly. There is no reincarnation unless you are exiled to the mortal world and re-enter reincarnation. According to oriental legend, only a few chief engineers are physically sanctified: the Monkey King (so that he can come back from the underworld), Erlang God (see Erlang God for details), Nezha (without lotus body) and so on, and only these are named. The rest disappeared, all retired. Most of the ancient immortals have retired. It can be seen from the previous myths and legends that the scope of the sky is much smaller than before, because those spaces have been divided by the ancient gods.