The author of Mo Guai is Yang Zaichun, 1943, born in Tangshan, Hebei Province, a famous calligrapher, professor and expert enjoying special allowance from the State Council. Former president and editor-in-chief of Beijing Sport University Press. Lecturer in a series of lectures on calligraphy on CCTV. He has held many personal calligraphy exhibitions and lectures in Japan, South Korea, Singapore, Hong Kong, the United States, Switzerland and other countries and regions, and published more than 40 monographs.

Yang Zaichun, a calligrapher, had an indissoluble bond with ink for most of his life, and his artistic life was practiced between black and white of ink and paper. Because of his burly figure and dark skin, he is entangled with smoke and ink almost every day, so many friends call him "Ink Man". Over time, "Mo Ren" became his pen name.

As a pen name, it reflects the degree of his persistent pursuit of a career, and also reflects a personality and temperament in his pursuit.