When Mr. Luo was fighting crickets in the mansion, his black cricket won a lot of silver for him. He was so proud that he boasted about the value of the baby. His words were remembered by Zhang Yu, a carpenter who worked next door. The servants put the jar containing the black cricket on the table, and Zhang Yu, who couldn't help being curious, wanted to see the appearance of the "baby", and didn't want the black cricket to escape if he was not careful.