Why did Ji Gong in Stephen Chow make his parents angry?

After Jigong became a monk, it happened that his servants came to see him. Speaking of parents who were seriously ill and were about to die, Jigong went home to visit his parents, only to find that their parents were both dead and their home was occupied by their former housekeeper, so he set fire to Li's house, first, to punish evil and promote good, and second, because he became a monk, his parents had died, and after burning it, he forgot the past.