Long, long ago, in the Sun family of Dajidian Village, there was a gentleman with a big mouth, and people called him Sun Kaizi. This person is kind-hearted, cultivates good morals, and never harms any small animals, so some people also call him Sun Shanren. One day, he returned from handling goods in Baoding Prefecture and walked to the fox den near the east end of the village. He met two young people who had caught a kidnapped fox and were tying it up. Sun Kaizi approached and asked two young people, "What are you going to do with this fox?" One young person said, "We've taken its skin and sold it. I heard it's very valuable." Sun Kaizi said, "Since you want to sell money, I'll give you five drops of money and sell it to me!" The two young people were happy to hear this and said, "Since you're so agile, okay, let's give it to you. As he spoke, he took out five hanging coins and handed them to two young people, who happily left. Mr. Sun untied the rope for the fox and saw that one leg was injured. He untied his cloth belt, wrapped it with a cloth strip, and let it run away. But the fox took two steps and stopped, staring at Mr. Sun who refused to leave. Mr. Sun said, "Hurry up and run for your life. If you miss me, my name is Sun Haozi. I run a grocery store and come back to me later." After saying this, the fox seemed to understand something and slowly walked away.



Sun Huozi runs a grocery store on the south side of Dajidian Street, with a small storefront but a wide range of goods. There are many people buying things every day, and profits are also decent. But who knew that another household on the north side of the road, the Zhang family, had also opened a new grocery store. The storefront is very large because he has just opened a new business. The goods he bought were also very comprehensive and priced at a low price. The people who bought them all went to the Zhang shop, so naturally the Sun shop was very deserted. Day in and night out, he couldn't sell for much money. As soon as he settled the bill at night, Mr. Sun became worried and couldn't eat enough, invisibly getting really angry. My wife saw it in her eyes and carefully advised me, "Don't get caught up in it. Doing business pays off and earns money. As long as you don't deceive or harm others, and the goods are genuine, the business will definitely prosper." Suddenly, one day, Mr. Sun felt that he didn't sell anything, but his money box was full. Where did he get so much money? Mr. Sun was very puzzled, but the next day he heard a commotion in the Zhang shop in the west of the village, saying that there was a thief. He had sold a lot of goods, but there was not a single copper coin in the cash register. He had lost it somewhere. He thought the child had stolen him and beat him up. The child cried and shouted, "You wronged me, I didn't take the money



The Zhang family shopkeeper couldn't find the reason, and one night he settled the bill and counted the money. He thought I had locked it up, but he saw that there was still a lot less. However, when he looked at the cash register in the morning, he was dumbfounded and the money was gone again.



Sun Kaizi still hasn't sold much on his end, and his money box is full, so he can't figure out what's going on. That night, the Zhang family shopkeeper said, 'I'll use a red string to make a mark and see where the money goes.'.



In the morning, Sun Haozi looked at the money box, which was filled with strings of large coins tied up with red ropes. He had long heard that the Zhang shop across the street was always short of money, so he took the initiative to approach the Zhang shopkeeper and said, "I heard you are always short of money. Is there any mark on your money