Cut the pork into bite-sized pieces.
Slice the onion and green onion.
In a bowl, mix pork, gochujang (red chili paste), soy sauce, minced garlic, chili powder, and pepper well, then marinate for 10 minutes.
Add cooking oil to a pan and stir-fry the green onion first to make scallion oil.
Add the pork and onion, then stir-fry over high heat.
When the meat is cooked, reduce the heat and add the remaining seasoning, then stir-fry more.