Dice the pork belly and pork tenderloin into small, uniform bite-sized pieces.
In a large skillet or wok over medium-high heat, add the pork belly and cook until the fat renders and the edges become crispy.
Add the diced pork tenderloin to the pan and sauté until browned on all sides and cooked through.
Stir in the minced garlic, grated ginger, and the white parts of the green onions, cooking for one minute until fragrant.
Add the chopped kimchi and the cooked brown rice to the skillet, breaking up any clumps of rice with a spatula.
Pour in the tamari, gochujang, and sesame oil, then toss everything together until the rice is evenly coated and heated through.
In a separate small non-stick pan, fry the egg until the whites are set but the yolk remains runny.
Plate the fried rice, top with the fried egg, and garnish with the remaining green onion tops, sea salt, and black pepper.