There is a story in Chinese folklore about a young farmer who found a field snail by a river and brought it home. Every night, the field snail turned into a beautiful girl who cooked and cleaned his room.

The farmer fell in love with the mysterious girl and wanted to marry her. The girl agreed to the farmer's proposal, but made one condition: after the marriage, she could not speak or laugh out loud. The farmer agreed to her request and the two were married.

After the marriage, the farmer found his wife to be very hardworking, taking care of all the affairs of the house. However, as time passed, the farmer began to miss interacting with his wife, so he asked her to talk and laugh. The girl obliged him, but warned that if she spoke or laughed out loud, their happily ever after would be over.

One day, the girl accidentally laughed out loud during a conversation with a neighbor, and sure enough, she turned into a field snail and returned to the tank forever. From then on, the farmer never saw his wife again. This story tells people to learn to cherish the happiness in front of them and not to change it easily.