Heat a pot over medium-low heat and add chili oil, chili powder, and garlic. Stir for 1 minute, taking care not to burn the chili powder.
Add clams and shrimp, stirring quickly to coat with the chili sauce. Pour in fish sauce and soy sauce, then stir.
Add dried kelp and anchovy stock. Boil over medium-high heat until the liquid reaches a rapid boil, about 2 to 3 minutes.
Add tofu, mushrooms, and egg. Cook for 2 to 3 minutes. Season with salt if needed.
Top with green onion, black pepper, and sesame oil. Serve hot with Korean rice and side dishes (banchan).