1. Cut bone from pork; reserve bone. Cut meat across the grain into very thin slices. Place pork in a medium bowl. Add chile, garlic, and oil; toss well to coat. Let stand at room temperature for 10 minutes.
2. Heat a large saucepan over medium-high heat. Add pork mixture; sauté 3 minutes or until pork is lightly browned, stirring frequently. Remove pork from pan. Add reserved bone and kimchi to pan; cook 2 minutes, stirring frequently. Add 3 cups water; bring to a boil. Reduce heat, and simmer, uncovered, for 20 minutes.
3. Cut tofu into 1/2-inch-thick slices; cut slices crosswise into 3/4-inch pieces.
4. Remove bone from soup. Return pork mixture to soup. Add tofu to soup; simmer 5 minutes. Sprinkle with green onions.
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