☆Kim Sun-sik, the owner, learned general techniques such as molding, plastic, and glaze from his father (Kim Bok-man) during his middle and high school years, and has been running Gwaneumyo in Galpyeong-ri, Mungyeong-eup, Gyeongsangbuk-do, since his father's death.

☆The blue and white porcelain is a white porcelain decorated with an oxidized cobalt that turns blue when it is reproduced at a high temperature of over 1200°C.
The blue-and-white porcelain, which combines a white background and a blue pattern to represent a fresh and refined decorative beauty, began to be used in the decoration of white porcelain from the Yuan Dynasty (1279-1368) in China, and was also widely produced until Ming and Qing Dynasties.

Due to this influence, blue and white porcelain began to be made in Korea around the mid-15th century in the early Joseon Dynasty, and until the late Joseon Dynasty, it was made mainly of official pottery installed in Gwangju, Gyeonggi-do.

Sagijang Han Sang-gu, an intangible cultural asset of Gyeonggi-do, succeeded his grandfather Han Sang-gu and his father Han Ho-seok, who worked at the pottery testing laboratory of the Governor-General of Korea, and succeeded his three-generation family business, using traditional kilns to produce white porcelain while sticking to the white porcelain color and the blue painting techniques of the late Joseon Dynasty.

His work is very elegant, and the manufacture of earth and the use of tools are considered to be the best reproduction of traditional blue and white porcelain.

☆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.