In a small pot with sesame oil, add in the onion, scallion/green onion and garlic. Saute for 1-2 minutes or until soft. Add the Korean red pepper flakes, soy sauces and sugar - stir well until it becomes a paste.
Add the kimchi and pork belly, and stir fry until the pork is cooked. Add in the dashima stock and zucchini and let it boil for 5 minutes or until the zucchini is cooked. Season to taste.
Add the tofu, egg and green onion garnish. Let boil further to partially cook the egg. Serve hot with rice.