What story did Zaoer tell in this play?

Old man: "Don't laugh. My son's name is jujube, which is very nice and smooth. When he was born, a fortune teller passed by the door and made a divination. He hit the wood! Well, you will know that there is "wood" in jujube after reading the book. You see (gesturing "wood" in the air with your hand), it turns out that his name is jujube!

Because the fortune teller said that the old man's son was short of wood, and the name jujube contained the father's deep love for his son and his hope for his healthy growth, which was different from the jujube of Lu Xun's youth.

Moisten soil

The reason is the same, because it also explains

Moisten soil

Born in a leap year, the five elements lack soil.