Clean shrimp, squid, and assorted seafood thoroughly.
Finely chop garlic and onion.
Heat oil in a pan and sauté garlic and onion.
Add seafood and stir-fry over high heat.
Mix in the sauce (gochujang, soy sauce, sugar, pepper, sesame oil) and combine well.
Add green onion and spicy chili pepper, stir-fry one last time to finish.