Cold noodles are a traditional Korean food, made of buckwheat noodles or wheat noodles (also corn noodles, sorghum rice noodles and elm bark noodles). Koreans have a tradition of eating cold noodles at noon on the fourth day of the first month or on their birthdays. According to folklore, eating slender cold noodles on this day will bode well for longevity, so cold noodles are also called "longevity noodles".
After reading it, you will know that the raw materials are not worth a few dollars, and you need to add water and flour.
Noodles are used less, so the cost is naturally not too high.