Place the diced pork belly in a cold skillet and turn the heat to medium, cooking until the fat renders and the meat becomes crispy and golden brown.
Remove the pork belly from the pan, leaving about one tablespoon of the rendered fat in the skillet for flavor.
Add the minced garlic and the white parts of the sliced scallions to the skillet, sautéing for one minute until fragrant.
Stir in the chopped kimchi and gochujang, cooking for two minutes to caramelize the sugars and deepen the umami profile.
Add the cooked brown rice, crispy pork belly, and tamari to the pan, pressing the rice down to develop a slight crust before tossing everything together.
In a separate small non-stick pan, heat the sesame oil over medium heat and fry the egg until the whites are set but the yolk remains runny.
Transfer the fried rice to a bowl, top with the fried egg, and garnish with the remaining green scallion tops and black pepper.