What's the story of Meng Po and Yue Lao?

Meng Po stayed in Naiheqiao for ten thousand years, and finally ushered in the day of liberation.

"Come on, dry this bowl of Meng Po soup, and I'll get off work when you're on the road." Meng Po said to the person in front of him.

The man took Meng Po's soup with a smile and drank it down. Meng Po watched him walk away.

"Eternal reincarnation, your eyebrows are the same as those of that year." Meng Po shed tears and vanished.

The man was shivering all over, but Meng Po Tang was ineffective for him.

"Welcome to the hidden king of the earth". People sit on the ground and become Buddhas, while ghosts come to worship.