It is called "dangmyeon" which is also used in foreign countries, or "sweet potato noodles"
Sweet potato noodles are noodles made from sweet potato starch powdered to cover the starch in sweet potatoes. It is used in Korean cuisine such as japchae or itsuitsanydish that can be used with noodles.
The precooking state is a little opaque and dry, elastic, so it does not break well even when bent. When heat and moisture are applied through cooking, it becomes more transparent and chewy
Feature: 1.3~1.4mmthick, the time and texture of ripeningvary depending on the thickness. The thicker the texture, the morechewy the texture is.