The King of Hell is not just one person who is in charge of life and death. Back then, the Emperor of Heaven was afraid that the King of Hell would have too much power to control the life and death of human beings in the world. Now, the Kings of Hell take turns taking office, just like how people go to work today.
In fact, the Emperor of Heaven is just thinking nonsense. No one can last long in this kind of hard work. He cries and listens to those bitter people all day long saying that they don't deserve to die but still want to live. It's hard for them to hear it.
So why is the King of Hell going to work when it's not his turn yet?
The Emperor of Heaven asked them to choose a human being to stay with them and help them solve the sufferings in their lives. This could be regarded as the Emperor of Heaven's great compassion and consideration for all living beings!
Nonsense! It's obviously our King of Hell...
Yan Laoliu retorted that he was dismissed by the Emperor of Heaven and went to work as a soul-locker, so Yan Laoliu shut up, lowered his head and concentrated on doing things.
If you don't go to the human world to help others, then you'll be helping Gong!