As a winter season heating apparatus of a shape that put a heat radiation apparatus under the table and put a quilt thereon, people used to have a friendly talk or reading etc putting their feet into the quilt under the table.
That is not so familiar article to Korean people though it is the very Kotatsu which is an indispensable article in passing the winter to Japan where underfloor heating device like Korea is none.
Kotatsu, a traditional Japanese heating apparatus, is an article to have been installed a wooden frame called Yagura on a small vessel to keep insulation by using the electricity and put a quilt thereon in modern times.