Dice the chicken breast into bite-sized pieces and season with sea salt and black pepper.
Heat a large non-stick skillet over medium-high heat and add half of the sesame oil.
Sauté the chicken until golden brown and cooked through, then remove from the pan and set aside.
In the same pan, add the remaining sesame oil along with minced garlic, grated ginger, and the white parts of the sliced green onions.
Add the chopped kimchi and gochujang, stirring for 2 minutes until the kimchi begins to caramelize.
Incorporate the chilled brown rice and tamari, pressing the rice down to develop a slight crisp for 3-4 minutes.
Fold the cooked chicken back into the rice mixture and stir to combine.
In a separate small skillet, fry the egg until the whites are set but the yolk remains runny.
Plate the kimchi fried rice, top with the fried egg, and garnish with the remaining green onion tops.