☆Sagi is often a relative concept of pottery that does not glaze, and refers comprehensively to glazed porcelain that has been made at temperatures above 1250°C.

Sagi-jang means a master craftsman who makes porcelain, such as white porcelain, celadon, and buncheongsagi ware(a grayish-blue-powdered celadon).

During the Joseon Dynasty, 360 Sagijangs belonged to Saongwon, which was in charge of royal meals, and were in charge of producing royal white porcelain at the official residence in Gwangju, Gyeonggi-do.

White porcelain is represented by the use of white clay, which is low in iron oxide, and the reproduction at high temperatures by sampling a high-resolution glaze of feldspar series.

Sagijang Seo Kwang-soo met with artisan Ji Soon-taek in the early 1960s and began to learn pottery techniques for 25 years.

He started to run Handoyo in 1986 and has been working until now. He was designated as the 14th Master of the Republic of Korea in 2003 and the Gyeonggi-do Intangible Cultural Property (White porcelain) in 2005.

He uses a traditional firewood klin to create a variety of white porcelain works, including moon jars, which are evaluated to have perfectly embodied the milky-white color of Joseon white porcelain.