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Slice pork belly into long strips about ½" thick, then thinly slice strips crosswise. Heat a small pot over medium. Add pork belly and cook, stirring often, until some fat has cooked out into the pan and meat is cooked through but not browned, about 3 minutes. Pour off all but 1 Tbsp. fat (if needed). Add onion and cook, stirring often, until translucent, about 5 minutes. Add kimchi and juices and cook, stirring occasionally, until liquid evaporates and kimchi is softened, about 5 minutes.
Add gochugaru, gochujang, and 2 cups water and bring to a simmer over medium-high. Reduce heat to medium and cook, stirring occasionally, until kimchi is very tender and flavors in stew come together, 20–30 minutes.
Add tofu to stew and cook until heated through, about 3 minutes. Divide stew among bowls and top with scallions. Serve with rice alongside.
Do Ahead: Stew can be made 4 days ahead. Let cool; cover and chill.