In the first chapter of Dream of Red Mansions, Cao Xueqin said: On the banks of the Sansheng Stone on the bank of the Ling River in the west, there is a plant of indigo plant. The waiter of Shenying in Chixia Palace, the roommate, irrigated it with nectar every day, and the plant began to prolong its life. Later, after being nourished by the essence of heaven and earth and regained nourishment by rain and dew, she had to take off the wood of the straw body and change into a human form. She only cultivated a female body and wandered outside the Lihen Heaven all day long. When she was hungry, she ate honey and green fruits as a meal, and when she was thirsty, she drank seawater as a soup. Just because the virtue of irrigation has not yet been repaid, there is a lingering meaning in the five elements. Just recently, the waiter of Shenying had a burning heart. Taking advantage of the prosperity of the Taiping Dynasty, he wanted to go down to earth to create a magical destiny, so he registered in front of the case of the Jinghuan Fairy. The Fairy Jing Huan also asked that the love for irrigation has not been repaid, so it is understandable to take advantage of this. The Fairy Jiangzhu said: "He is the favor of nectar, and I don't have the water to repay him." Since he was born as a human being, I could not repay him more than I gave him with all the tears I shed in my life. '