Blend soy broth and tofu in a blender until smooth.
Season with salt, sugar, and vinegar.
Julienne cucumber, carrot, and cabbage.
Boil somyeon noodles, rinse in cold water, and drain well.
Make bibim sauce with gochujang, soy sauce, sugar, minced garlic, and sesame oil.
Mix the boiled noodles with bibim sauce and vegetables.
Serve with soy protein broth on the side.