He discovered that, during the monkey's millions of years of being sealed, its body had given birth to two souls, one good and one evil, just like a person who was originally kind but suddenly harbored evil thoughts. These were the devils that emerged in the mind, which is why from the moment of birth, people are kind, but later change due to their environment.
As long as there is a chance, when evil thoughts arise, they should be changed to prevent their spread into the Mortal Realm to do evil.
Jiang Tang did not want a monkey soul that had given birth to evil thoughts to enter the Hell Palace and turn the demons inside into devils.
This was not what he wanted; inside there were still two hazards like ticking time bombs that had yet to be dealt with. It wasn't that he had no time, but he always felt that the time had not yet come.
He thought that the two hazards inside could be useful and hoped it would not turn out to be nurturing a tiger that would cause trouble.