Legend has it that there is a laurel tree 500 feet high on the moon. There was a man named WU GANG in the Han Dynasty who was obsessed with fairy tales and didn't concentrate on reading. So the Emperor was furious and shut him up in the Moon Palace, telling him to cut down the osmanthus tree, saying, "Cutting down the osmanthus tree will have magic." However, every time WU GANG cuts an axe, the tree wound will heal immediately. Day after day, WU GANG's desire to cut laurel was not realized. Therefore, WU GANG cut laurels in the Moon Palace all the year round, but he still couldn't cut down trees, so later generations can see the image of Wu Gang cutting laurels endlessly in the middle of the month. See Tang Duan's "Shicheng Youyang Miscellaneous Volume My Day".
The second legend is that WU GANG, also known as Wu Quan, was from Xihe. Sun Boling, the son of Emperor Yan, had an affair with WU GANG's wife when he left home for three years in WU GANG, and gave birth to three sons. WU GANG killed Boling in a rage, angered Emperor Yan, sent WU GANG to the moon, and ordered him to cut down the immortal tree-laurel. The laurel tree is 500 feet high and can be cut down together. Emperor Yan used this endless labor as a punishment for WU GANG. WU GANG's wife also felt guilty about her husband's experience and ordered her three sons to fly to the moon to accompany WU GANG. One became a toad, one became a rabbit, and one was unknown. See Shan Hai Jing.