颜真卿
The angular calligraphy styles of the early Tang masters, Yu Shinan, Ouyang Xun, and Yan Zhenqing, persisted in popularity until the 14th century, when the more rounded style of Zhao Mengfu came into vogue. Korean calligraphy became increasingly formalistic in the years that followed. Gim Jeong-hui (김정희, 金正喜, (1786–1856), also known as Kim Jeong-hui, is considered the greatest calligrapher in the Joseon dynasty, and he was also a scholar-official, painter, epigrapher, and practicing Buddhist. He was a master of many calligraphic forms but is most famous for "Chusache", the bold, freeform style he perfected while in exile on Jeju Island. He is known as the "chusa" style after his pen name 秋史, inspired by the ancient Chinese lishu script.