Break up any clumps in your cold rice using your hands or a fork. This ensures even cooking and prevents mushy spots.
Heat vegetable oil in a large skillet or wok over medium-high heat. If using bacon, cook it first until crispy, then remove and set aside.
Add diced onion and white parts of green onions to the pan. Sauté until the onion becomes translucent, about 2-3 minutes.
Add minced garlic and chopped kimchi. Cook for 3-4 minutes until the kimchi is slightly caramelized and fragrant.
Add the rice to the pan, breaking up any remaining clumps. Stir in kimchi juice, gochugaru, and soy sauce.
Cook for 5-7 minutes, stirring occasionally, allowing the rice to crisp up slightly at the bottom.
Stir in the cooked bacon (if using) and sesame oil. Mix well.
Serve hot, topped with a fried egg, green onion slices, and a sprinkle of sesame seeds.