Cut the squid and assorted seafood into bite-sized pieces.
Julienne the onion, carrot, and green onion.
Heat cooking oil in a pan and sauté the garlic.
Add the squid and seafood, stir-frying over high heat.
Add the vegetables and continue to stir-fry together.
Season with gochujang (Korean red pepper paste), soy sauce, gochugaru (Korean chili flakes), sugar, and pepper.
Stir quickly to let the seasoning absorb well and finish.