Slice the pork belly into small, bite-sized cubes and season with sea salt and black pepper.
Place the pork belly in a cold non-stick skillet over medium heat, allowing the fat to render slowly as the pan warms up.
Cook the pork belly for 8-10 minutes, turning occasionally, until the edges are golden and crispy.
Add the chopped kimchi and gochujang to the skillet, sautéing for 2 minutes until the kimchi is softened and fragrant.
Stir in the chilled jasmine rice, breaking up any clumps with a spatula, and cook for 3 minutes until the rice begins to toast.
Pour the liquid egg whites over the rice mixture and stir constantly for 2 minutes until the whites are fully cooked and have coated the rice grains.
Drizzle with tamari and toasted sesame oil, then toss everything together one last time to combine the flavors.
In a separate small non-stick pan, fry the whole 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 thinly sliced green onions.