Wash black soybeans thoroughly and soak for at least 6 hours.
Boil the soaked soybeans in boiling water for 15 minutes.
Remove the skins from the boiled soybeans and rinse them in cold water.
Blend the boiled soybeans with cold water and a pinch of salt until smooth to make the soybean broth.
Cook the thin wheat noodles and rinse in cold water, draining well.
Place the noodles in a bowl and pour the soybean broth over them.
Top with julienned cucumber and cherry tomatoes, then drizzle one tablespoon of perilla oil.