Rinse the tofu noodles in cold water.
Slice onion, green onion, spicy chili, garlic, carrot, cabbage, and king oyster mushrooms into bite-sized pieces.
Heat cooking oil in a pan and sauté garlic, green onion, and chili to release the aroma.
Add onion, carrot, cabbage, and mushrooms, and stir-fry.
Add seafood (mussels, squid, shrimp) and stir-fry.
Season with chili powder, soy sauce, oyster sauce, and black pepper.
Add water and chicken stock, then bring to a boil.
Add tofu noodles and boil once more.
Serve the completed spicy seafood soup in a bowl.