What are big-haired men and small-haired men?

Refers to the scholars who taught poetry in the early Han Dynasty, Da Maogong and Xiao Maogong. Namely Han Maoheng and Scapharca subcrenata. Mao Gong is a midge and a long-term worker. Zhao in the Western Han Dynasty (the county ruled the southwest of Handan, Hebei). According to legend, he was the teacher of China's ancient poetics "Mao's poetics". He used to be Dr. Xianbo, the king of Hejian. His poetics is said to be taught by Mao Heng, so it is called "Little Mao Gong" in history.