Cut pork and vegetables into bite-sized pieces.
Prepare the sauce (gochujang, soy sauce, sugar, minced garlic, etc.) and marinate the pork.
Heat cooking oil in a pan and stir-fry the marinated pork.
When the meat is cooked, add vegetables (onion, green onion, chili pepper, etc.) and stir-fry again.
Once all ingredients are cooked, transfer to a plate and serve.