Prepare the seafood: Sear shrimp, scallops, and fish fillets in a pan with a little oil for 3-4 minutes on each side. Set aside.
Make the broth: In a large pot, combine seafood stock, miso paste, soy sauce, sesame oil, garlic, ginger, and chili paste (if using). Simmer for 10 minutes.
Cook the noodles: Boil ramen noodles according to package instructions. Drain and set aside.
Assemble the ramen: Place cooked noodles in bowls. Pour hot broth over noodles, then top with seafood and optional toppings (soft-boiled egg, bamboo shoots, corn, etc.).
Serve: Garnish with chopped scallions and nori strips. Serve hot and enjoy!