Because Mo Ming was kind-hearted and helpful, word of his good deeds spread to some areas.
This fame also brought him trouble.
He began to feel that he was being watched, and there were people with bad intentions around him.
So he moved, and after accumulating enough evil energy to sustain the rest of his life, he stopped catching ghosts.
After two years of peace, when his child just started to walk, he heard that there was a family in the neighboring county that was haunted by an evil spirit, so he decided to secretly help them.
When he arrived there, he realized that he was set up.
That group who set him up knew that he was a soul escort. Not only that, the group was backed by an even larger organization that sought out "soul escorts" like Mo Ming.
They needed that huge amount of evil energy in Mo Ming's body because evil energy was extremely beneficial to ordinary people.