In ancient times, there was a black man named Bao Gong, who was a high official in the imperial court and could do things for people everywhere. One year, the mountains in the south of the capital were devastated, and people hoped to collect some early grain to make a living. Unexpectedly, the large grain was not ripe, and it was eaten by groups of monkeys. The people could not report it to Bao Gong. Bao Gong distributed grain to the people, and asked everyone to hunt around the mountain and set fires. After people took care of it a few times, most of the monkeys were captured and burned, and they could no longer harm crops in groups.

In the early autumn of this year, the grain was well harvested in the evening, and the people were considered to have a living grain. This time, she annoyed the Monkey Queen. Her ability is great, and she will change. After escaping her life, she is determined to kill Duke Bao and take revenge on humanity. After thinking about it, she turned into a beautiful woman she had never seen in the world, and specially guarded the gate of the palace to perform entertainments. The emperor was a greedy old man. When he saw her outside the palace, he was fascinated. He hurriedly asked his subordinates to call her into the palace and immediately married her as a little wife. The Queen Monkey played a seductive way, sticking to the emperor like Ciba candy. The emperor was very fond of her and obeyed her everywhere. After breakfast one day, the emperor accompanied the Queen Monkey King to have fun and did not come to the hall for a long time to discuss. Bao Gong had no choice but to break into the inner palace to play. The Monkey King stared at him viciously for a while. Bao Gong was very puzzled in his heart. When he had just left the palace, the Monkey King hurriedly cried out that his skull was aching and rolling on the ground. The emperor quickly helped her and asked what kind of illness had occurred. The Monkey King pretended to be pitiful and cried: "This man just now had bad intentions for me, and I was very afraid. If I see him again, I will be dead. Please make the king master, and kill him quickly." The emperor comforted and meditated for a while, and it was not until he agreed to kill Bao Gong that the Monkey King came over pretending to be in the sun and danced a few dances happily.

After noon, the emperor went to the palace alone, scolded him for offending the new princess, and told him to commit suicide. Duke Bao was not panicked, but asked him about offending the new princess. The emperor couldn't answer, so after thinking about it, he ordered Duke Bao's official position removed and kicked out of the capital. The emperor returned to the harem and pretended to tell the female monkey king that he had beheaded Duke Bao. The Monkey King believed this and was so happy that he scratched his head, thinking that he would take revenge on the mountains later. Besides, after Duke Bao was kicked out of the capital, he thought about the strangeness of the new princess while walking, suspecting that she was a monster. Duke Bao couldn't find a way to subdue for a while, so he kept walking forward.

One evening, Bao Gong walked into a house on the side of the road to stay overnight. The host agreed, but said with a frown, "My girl is very sick, and a monster breaks into the house every night to haunt her." Bao Gong thought for a while and said, "Don't be afraid, I'll take care of the monster!" He rested in the corner of the gate, with a sharp knife on his pillow. In the middle of the night, there was a sudden howling of wind outside the gate, and indeed a strange voice shouted, "Open the door, big brother, open the door!" It turned out that the big door bolt of this house was made of thousand-year-old rock fir wood, and it had been used for six or seven generations, and it had become an elf. He recognized that Bao Gong was not a mortal, and did not dare to open the door as it was at night. The monster outside shouted for a while, but when he saw that the door was always open, he left in disappointment. After a while, Bao Gong asked, "Brother Doorbolt, which monster is outside?" The door bolt spirit knew that Bao Gong was everywhere for the people, so he answered honestly, "It was the spirit of the largest plantain tree at the foot of the village. If you are not here, I dare not not open the door!" Bao Gong kept it in mind and slept peacefully.

The next morning, Lord Bao called the master's house to bring a hoe, each carrying a handful, found the largest plantain tree, and worked together to dig it up. From that night on, no more monsters came shouting at the door to pester the girl. The owner thanked Lord Bao very much and took out a lot of gold and silver as gifts. Lord Bao did not accept it at all. The master's house said, "You are our savior, so we can feel at ease by giving some as souvenirs." Lord Bao nodded and said, "Then give me the big door bolt to use for a while, and your house will be replaced with a new one." The master's family happily agreed. Lord Bao carried the spirit of the door bolt and continued to walk forward. He asked the door bolt spirit, and the spirit of the door bolt had been in the world for a long time and could answer everything.

When Duke Bao asked the new princess what was going on, the door bolt spirit said, "That was the transformation of the female monkey king. It has practiced for a long time and has great powers. Two hundred years ago, I was still a part of the thousand-year-old rock cedar, and the female monkey king often came to climb up and down." Duke Bao explained the whole story and asked, "In order for the people to no longer suffer from the infestation of monkeys, Brother Door Bolt, you have to help give birth to a way, let's clean it up together." The door bolt spirit rattled and agreed, and it said, "Duke Bao, after you want two more things, we can transfer back to the palace to do business." Duke Bao nodded and continued to walk forward with the door bolt spirit.

In less than two days, he came to the big mountain surrounded by clouds and fog, and met a group of mountain chasers. The door bolt spirit whispered, "Buy the thinnest mountain dog!" Bao Gong touched his pocket, but he didn't have any money. He immediately took off his hat inlaid with a few jade artifacts and talked to the mountain chasers about a business, and got the thinnest mountain dog in exchange. Then Bao Gong carried the door bolt spirit and the mountain dog, and continued to walk forward. Two days later, when he came to a large river in the deep forest, he met a group of birdmen. The door bolt spirit whispered: "Buy the big bird with the sharpest mouth! Bao Gong touched his pocket again, but he still didn't have any money. He thought for a while, took off the belt with a few pieces of silverware, and negotiated a business with the networker, in exchange for the big bird with the sharpest mouth. At this time, Bao Gong said happily: "Brother Doorbolt, let's go back!" The door bolt spirit rattled and said: "Brother Dog, bird girl, you have all been bullied by the female monkey king before. Now we listen to Duke Bao and work together to get rid of him." Both the dog and the bird nodded happily. Everyone followed Duke Bao and turned to run to the capital.

The gatekeeper in the capital trusted Duke Bao and immediately let him go. Duke Bao carried the door latch spirit and the big bird, and brought the mountain dog to the gate of the palace. The gatekeeper didn't dare to let it go at first, but later heard the door latch saying that the new princess was transformed by the female monkey king. If he didn't get rid of it, it would harm the whole country. Only then did he have the courage to open the palace gate. Duke Bao led the group to the imperial garden and ran into the emperor and the female monkey king who were having fun. The emperor recognized Duke Bao and shouted angrily: "Bao Heidan, are you still doing that?!Duke Bao pointed to the female monkey king and said, "Your Majesty, your new princess has been transformed by the female monkey king. It has done a lot of bad things, and I will clean it up now. The female monkey king saw that Duke Bao had dogs on the left and birds on the right, and she was very afraid, so she pretended to cry: "The emperor is in charge, it is Bao Heidan who hates me and wants to separate our husband and wife."

The emperor lost his head and hurriedly called for someone to catch Duke Bao. Duke Bao nodded to the door bolt spirit, and the door bolt spirit shouted: "The female monkey king, quickly reveal the original shape; the female monkey king, quickly reveal the original shape." The mountain dog pounced up and bit the female monkey king hard; the pointed-billed bird flew up and pecked the female monkey king's eyes hard. The female monkey king couldn't run away, and rolled a few times on the ground, only to show her original shape. The mountain dog immediately bit it to death. The emperor was very disgusted when he looked at the dead monkey king, and finally understood. He also ordered Duke Bao to be reinstated and continue to work. When Duke Bao returned to the mansion, he did not forget the credit of the dog and bird, and fed her well. As for the door bolt spirit, it is said that he has been helping Duke Bao to solve the case in the future.