Why did Chang 'e take a rabbit to the moon? How did WU GANG get up there?

Rabbit explained that there were two kinds of people in Boyikao, the son of Zhou Wenwang who was killed by da ji. Da ji chopped it into minced meat and made it into a pie for Zhou Wenwang. After Zhou Wenwang returned to Xiqiao, he spit out the rabbit. It was a spit rabbit. Later, when Chang 'e saw Bo Yikao, who became a rabbit, she fell in love with the original da ji and associated it with WU GANG, the Moon Palace. 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.