Soak soybeans in water for over 8 hours.
Rinse the soaked soybeans thoroughly and boil them.
Peel the skins off the boiled soybeans.
Blend the peeled soybeans finely with water in a blender.
Strain the blended soy milk through a sieve to make it smooth.
Boil somyeon noodles, rinse them with cold water, and drain.
Place the noodles in a bowl and pour the soy milk over them.
Finish with salt, julienned cucumber, sesame seeds, etc. according to your taste.