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In the past, it was called Okchung and there was a time when the shell of the silkworm was used in accessories, but now it is not only rare but also almost extinct, and it has become a level 1 endangered insect. It is difficult to breed, but in Korea, the Yeongwol Insect Museum is conducting breeding research and they say that the population is increasing little by little every year. I am finally introducing the silkworm, which is so beautiful but rare that you will never see it in your life.