Slice the pork belly into bite-sized pieces and season with sea salt and black pepper.
Heat a large skillet or wok over medium-high heat and add the pork belly, searing until the fat has rendered and the edges are golden and crispy.
Remove the pork from the pan, leaving about one tablespoon of the rendered fat in the skillet.
Add the minced garlic, grated ginger, and the white parts of the green onions to the skillet, sautéing for one minute until fragrant.
Stir in the chopped kimchi and sauté for another two minutes to develop a deep, caramelized flavor.
Add the cooked brown rice and cauliflower rice to the pan, pressing them down firmly with a spatula and letting them sit undisturbed for three minutes to create a crispy crust.
Push the rice mixture to one side of the pan and pour in the liquid egg whites and the whole egg, scrambling them until just set.
Incorporate the tamari, gochujang, and sesame oil, tossing everything together with the crispy pork belly until well combined.
Garnish with the sliced green onion tops before serving.