What does Kuang Zhong Cha mean by the strange rat stealing incident?

There is a play called Fifteen Levels, and there are many kinds. The plot is as follows: Wuxi butcher Youhu Road borrows fifteen customs to do business. He joked with his daughter that he was selling her fortune, but her daughter believed it and ran away that night. In the middle of the night, a gambler named Lou Rat broke into You's house, stole fifteen dollars to pay off his gambling debts and killed You Hulu. Later, she falsely accused Su Shujuan of killing her father for money. After Shu Juan fled, she walked with an unknown businessman, Xiong Youlan. Neighbors found her suspicious and the bear happened to have money with her, so she was sent to the county government to see the official. The magistrate of a county listened to the rumors and sentenced Su and Xiong to death on charges of hooking up with an adulterer and stealing money to kill their father. Kuang Zhong, the official in charge of beheading, felt resentment between them and tried to stop beheading. After a detailed investigation, he found the flaw of the floor rat and then disguised himself as a fortune teller. Get Lou Rat's murder confession, and finally take Lou Rat back to the county government, plead guilty in court, clarify the right and wrong, bring the murderer to justice, and avenge the wrongs. Do you know your answer?