Clean the squid and shrimp thoroughly, then cut into bite-sized pieces.
Slice onions, bell peppers, and other vegetables into pieces suitable for eating.
Add cooking oil to a pan and sauté the onions and bell peppers over medium heat.
Add the squid and shrimp and stir-fry over high heat.
Add soy sauce, gochujang, minced garlic, and other seasonings, then mix well.
When the ingredients are cooked and well-seasoned, turn off the heat and serve.