Soak the cleaned soybeans in water for at least 8 hours.
Boil the soaked soybeans in boiling water for 10 minutes.
Rinse the boiled soybeans in cold water and peel off the skins.
Put the peeled soybeans and water into a blender and blend smoothly to make the soy milk broth.
Cook the noodles, rinse them in cold water, and drain off the excess water.
Place the noodles in a bowl and pour the soy milk broth over them.
Top with julienned cucumber, boiled egg, salt, or other toppings of your choice.