Slice green onions, onions, garlic, and spicy green chili peppers diagonally.
Add cooking oil to a pot, then stir-fry green onions and garlic.
Add red chili powder and stir-fry over low heat, being careful not to burn.
Add water, kelp, onion, dried shiitake mushrooms, and spicy green chili peppers to the pot and bring to a boil.
Season with soybean paste, soy sauce, and salt.
Boil for 10 minutes, then remove the solids.