A brush, ink, paper, and inkstone are some of the oldest writing tools. Relics from the Three Kingdoms Period were also excavated in Korea, but they may have been used before then. The dignity of the inkstone is determined by the quality of the stone making the inkstone and the level of carving on the inkstone.

In general, the stone of the inkstone has a low hardness, making it impossible to make lively sculptures. What helped overcome this limitation was Danyang's magnet 石, owned by Shin Geun-sik, the owner of the rice paddy field. The stone is unique and beautiful in color, but it is two to three degrees stronger in hardness than other inkstone, allowing it to be carved in three dimensions.

Magnetized inkstone is practical. Other stone-capped inkstones are carved with stones, and when the stone eats water, it becomes weaker, causing more residue, and as time goes by, the stone bursts and splits. But despite its firmness, the magnet grinds its prey finely, and no dregs occur. In particular, even if water is stored for several days, it is so water-resistant that it does not permeate, that it does not crack or burst even after decades or hundreds of years.

Shin Geun-sik started his family business when he was 17 years old and ended his apprenticeship period, which usually takes three years. His works vary in size and shape. There are many original works such as dragon, turtle, and horseback riding.

Also, Shin Geun-sik's works give the same impression as woodwork. The reddish colors and engraved patterns are delicate and soft, making them look like woodblocks and pasting them.