Chinatown Detective 2 Why did the murderer change people?

In this movie, the murderer is a forensic doctor who has his own hospital. He saved hundreds of lives, but unfortunately, his wife's life was taken. His most trusted God gave him cancer. He thinks he has only one choice, that is, to become a god, so he can only become a god if he kills people who are full of five elements.

Tao gives birth to one, two, three and everything. It was his idea.