Cut pork, kimchi, onion, tofu, and other ingredients into bite-sized pieces.
Add cooking oil to a pot and stir-fry the pork.
Add the kimchi and stir-fry together, then add red pepper powder and mix well.
Pour in water, kimchi brine, and kimchi stew sauce, then bring to a boil.
Add onion, tofu, and green onion, and simmer over medium heat for 10 minutes.
Taste and adjust seasoning with salt or soup soy sauce as needed.