Who is the reincarnation of the beloved child's hole?

It's a little boy named Wu. He has a good friend named Hua Ling (Snake). Wu died because Chang Mu's father (later, the first generation of black impermanence) kept doing evil, which led to Chang Mu being told by fortune tellers that he would not live to be nine years old when he was a child. Later, under the guidance of Changmu's later master, the Changmu family went down the mountain to find a boy of the same age to change their lives for Changmu. This boy is Wu, so Wu died instead of Nagaki in nine years. Later, Hanako was sealed and then released unintentionally. Coincidentally, Hanako met the hole, then Hanako recognized the hole, and finally Hanako became the pet snake of the hole. .