In a mixing bowl, combine soy sauce, sesame oil, brown sugar, minced garlic, grated ginger, and gochujang. Mix well.

Add the sliced beef and pork belly to the marinade, ensuring all pieces are well coated. Cover and refrigerate for at least 30 minutes.

Preheat your grill or grill pan over medium-high heat.

Remove the meat from the marinade and grill for about 3-4 minutes on each side, or until cooked to your desired doneness.

Use tongs to flip the meat and avoid piercing it, which can cause juices to escape.

Arrange the grilled meat on a serving platter.

Serve with lettuce leaves, chopped green onions, kimchi, and cooked rice for wrapping and enjoying.