Marinate the pork meat with the gochugaru, garlic, and sesame oil for at least 10 minutes.
Sauté marinated pork until lightly browned. Remove from pan. Add reserved bone and kimchi, cook 2 minutes. Add 3 cups water, bring to boil. Reduce heat and simmer uncovered 20 minutes.
Cut tofu into slices ½” by ¾“.
Remove bone from soup. Return pork to soup. Add tofu. Simmer five minutes. Sprinkle with green onions.