Lu Yu said in the book of tea, "tea is a drink, which originates from Shennong." It is said that in the era of Shennong, more than 2700 BC, Shennong made herbs for the benefit of all living beings. One day, Shennong tasted a kind of grass leaves, which made him dry and dizzy. Suddenly, a gust of wind passed, and a fresh fragrance came. Looking up, Shennong saw the green leaves on the tree. He took a piece of it and chewed it carefully in his mouth. It tasted first bitter, then fragrant and sweet. After eating it, he felt more fragrant. The tongue was fresh and refreshing. His dizziness was relieved, and his dry mouth disappeared. Shennong was then called "tea", which is the earliest legend of tea.