Wash the soybeans thoroughly and soak them.
Boil the soaked soybeans in boiling water.
Blend the boiled soybeans smoothly with water in a blender.
Season the soybean milk with salt.
Boil the somyeon noodles and rinse them in cold water.
Place the somyeon noodles in a bowl and pour the soybean soup over them.
Drizzle perilla oil and top with cucumber, seaweed flakes, and other garnishes.